Access_Lists_Workbook_Student_Edition_v1_5 (2)

Access_Lists_Workbook_Student_Edition_v1_5 (2) - Any Access...

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Unformatted text preview: Any Access 0.0.0.0 Lists permit deny CL Workbook Version 1.5 Standard Extended access-group Wildcard Mask Student Name: access-list Access-List Numbers IP Standard IP Extended Ethernet Type Code Ethernet Address DECnet and Extended DECnet XNS Extended XNS Appletalk 48-bit MAC Addresses IPX Standard IPX Extended IPX SAP (service advertisement protocol) IPX SAP SPX Extended 48-bit MAC Addresses IPX NLSP IP Standard, expanded range IP Extended, expanded range SS7 (voice) Standard Vines Extended Vines Simple Vines Transparent bridging (protocol type) Transparent bridging (vendor type) Extended Transparent bridging Source-route bridging (protocol type) Source-route bridging (vendor type) 1 100 200 700 300 400 500 600 700 800 900 1000 1000 1100 1200 1300 2000 2700 1 101 201 200 700 1100 200 700 to to to to to to to to to to to to to to to to to to to to to to to to to to 99 199 299 799 399 499 599 699 799 899 999 1099 1099 1199 1299 1999 2699 2999 100 200 300 299 799 1199 299 799 Produced by: Robb Jones jonesr@careertech.net and/or Robert.Jones@fcps.org Frederick County Career & Technology Center Cisco Networking Academy Frederick County Public Schools Frederick, Maryland, USA Special Thanks to Melvin Baker, Jim Dorsch, and Brent Sieling for taking the time to check this workbook for errors, and making suggestions for improvements. Inside Cover What are Access Control Lists? ACLs... ...are a sequential list of instructions that tell a router which packets to permit or deny. General Access Lists Information Access Lists... ...are read sequentially. ...are set up so that as soon as the packet matches a statement it stops comparing and permits or denys the packet. ...need to be written to take care of the most abundant traffic first. ...must be configured on your router before you can deny packets. ...can be written for all supported routed protocols; but each routed protocol must have a different ACL for each interface. ...must be applied to an interface to work. How routers use Access Lists (Outbound Port - Default) The router checks to see if the packet is routable. If it is it looks up the route in its routing table. The router then checks for an ACL on that outbound interface. If there is no ACL the router switches the packet out that interface to its destination. If there is an ACL the router checks the packet against the access list statements sequentially. Then permits or denys each packet as it is matched. If the packet does not match any statement written in the ACL it is denyed because there is an implicit “deny any” statement at the end of every ACL. 1 Standard Access Lists Standard Access Lists... ...are numbered from 1 to 99. ...filter (permit or deny) only source addresses. ...do not have any destination information so it must placed as close to the destination as possible. ...work at layer 3 of the OSI model. Why standard ACLs are placed close to the destination. If you want to block traffic from Juan’s computer from reaching Janet’s computer with a standard access list you would place the ACL close to the destination on Router D, interface E0. Since its using only the source address to permit or deny packets the ACL here will not effect packets reaching Routers B, or C. Router B S0 S1 E0 Router D S1 E0 Router A S0 E0 Router C S1 S0 E0 Matt’s Computer Juan’s Computer Jimmy’s Computer Janet’s Computer If you place the ACL on router A to block traffic to Router D it will also block all packets going to Routers B, and C; because all the packets will have the same source address. 2 Standard Access List Placement Sample Problems FA0 Router A FA1 Juan’s Computer Jan’s Computer In order to permit packets from Juan’s computer to arrive at Jan’s computer you would place the standard access list at router interface ______. FA1 E0 S0 Router A E1 S1 Router B Lisa’s Computer Paul’s Computer Lisa has been sending unnecessary information to Paul. Where would you place the standard ACL to deny all traffic from Lisa to Paul? Router Name ______________ Interface ___________ Router B E1 Where would you place the standard ACL to deny traffic from Paul to Lisa? Router Name ______________ Interface ___________ Router A E0 3 Standard Access List Placement Router B S0 S1 Router A E0 S0 S1 FA1 S1 Router C Ricky’s Computer Jenny’s Computer Amanda’s Computer George’s Computer Carrol’s Computer Kathy’s Computer S1 Router D S0 Jim’s Computer E0 Jeff’s Computer S1 E0 S0 Router E FA1 S1 Router F Linda’s Computer Sarah’s Computer Jackie’s Computer Melvin’s Computer 4 Standard Access List Placement 1. Where would you place a standard access list to permit traffic from Ricky’s computer to reach Jeff’s computer? 2. Where would you place a standard access list to deny traffic from Melvin’s computer from reaching Jenny’s computer? 3. Where would you place a standard access list to deny traffic to Carrol’s computer from Sarah’s computer? 4. Where would you place a standard access list to permit traffic to Ricky’s computer from Jeff’s computer? 5. Where would you place a standard access list to deny traffic from Amanda’s computer from reaching Jeff and Jim’s computer? 6. Where would you place a standard access list to permit traffic from Jackie’s computer to reach Linda’s computer? 7. Where would you place a standard access list to permit traffic from Ricky’s computer to reach Carrol and Amanda’s computer? 8. Where would you place a standard access list to deny traffic to Jenny’s computer from Jackie’s computer? 9. Where would you place a standard access list to permit traffic from George’s computer to reach Linda and Sarah’s computer? 10. Where would you place an ACL to deny traffic from Jeff’s computer from reaching George’s computer? 11. Where would you place a standard access list to deny traffic to Sarah’s computer from Ricky’s computer? 12. Where would you place an ACL to deny traffic from Linda’s computer from reaching Jackie’s computer? Router D Router Name_________________ Interface ____________________ E0 Router A Router Name_________________ Interface ____________________ E0 Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ 5 Extended Access Lists Extended Access Lists... ...are numbered from 100 to 199. ...filter (permit or deny) based on the: source address destination address protocol application / port number ... are placed close to the source. ...work at both layer 3 and 4 of the OSI model. Why extended ACLs are placed close to the source. If you want to deny traffic from Juan’s computer from reaching Janet’s computer with an extended access list you would place the ACL close to the source on Router A, interface E0. Since it can permit or deny based on the destination address it can reduce backbone overhead and not effect traffic to Routers B, or C. Router B S0 S1 FA0 Router D S1 E0 Router A E0 S0 Router C S1 S0 E0 Matt’s Computer Juan’s Computer Jimmy’s Computer Janet’s Computer If you place the ACL on Router E to block traffic from Router A, it will work. However, Routers B, and C will have to route the packet before it is finally blocked at Router E. This increases the volume of useless network traffic. 6 Extended Access List Placement Sample Problems E0 E1 Router A Juan’s Computer Jan’s Computer In order to permit packets from Juan’s computer to arrive at Jan’s computer you would place the extended access list at router interface ______. E0 FA0 S0 Router A FA1 S1 Router B Lisa’s Computer Paul’s Computer Lisa has been sending unnecessary information to Paul. Where would you place the extended ACL to deny all traffic from Lisa to Paul? Router A Router Name ______________ Interface ___________ FA0 Where would you place the extended ACL to deny traffic from Paul to Lisa? Router Name ______________ Interface ___________ Router B FA1 7 Extended Access List Placement Router B S0 S1 Router A FA0 S1 S0 E1 S1 Router C Ricky’s Computer Jenny’s Computer Amanda’s Computer George’s Computer Carrol’s Computer Kathy’s Computer S1 Router D S0 Jim’s Computer FA0 Jeff’s Computer S1 FA0 S0 Router E FA1 S1 Router F Linda’s Computer Sarah’s Computer Jackie’s Computer Melvin’s Computer 8 Extended Access List Placement 1. Where would you place an ACL to deny traffic from Jeff’s computer from reaching George’s computer? 2. Where would you place an extended access list to permit traffic from Jackie’s computer to reach Linda’s computer? 3. Where would you place an extended access list to deny traffic to Carrol’s computer from Ricky’s computer? 4. Where would you place an extended access list to deny traffic to Sarah’s computer from Jackie’s computer? 5. Where would you place an extended access list to permit traffic from Carrol’s computer to reach Jeff’s computer? 6. Where would you place an extended access list to deny traffic from Melvin’s computer from reaching Jeff and Jim’s computer? 7. Where would you place an extended access list to permit traffic from George’s computer to reach Jeff’s computer? 8. Where would you place an extended access list to permit traffic from Jim’s computer to reach Carrol and Amanda’s computer? 9. Where would you place an ACL to deny traffic from Linda’s computer from reaching Kathy’s computer? 10. Where would you place an extended access list to deny traffic to Jenny’s computer from Sarah’s computer? 11. Where would you place an extended access list to permit traffic from George’s computer to reach Linda and Sarah’s computer? 12. Where would you place an extended access list to deny traffic from Linda’s computer from reaching Jenny’s computer? Router D Router Name_________________ Interface ____________________ FA0 Router F Router Name_________________ Interface ____________________ FA1 Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ Router Name_________________ Interface ____________________ 9 Choosing to Filter Incoming or Outgoing Packets Access Lists on your incoming port... ...requires less CPU processing. ...filters and denys packets before the router has to make a routing decision. Access Lists on your outgoing port... ...are outbound by default unless otherwise specified. ...increases the CPU processing time because the routing decision is made and the packet switched to the correct outgoing port before it is tested against the ACL. Breakdown of a Standard ACL Statement permit or deny wildcard mask access-list 1 permit 192.168.90.36 0.0.0.0 autonomous number 1 to 99 source address permit or deny source address access-list 78 deny host 192.168.90.36 log autonomous number 1 to 99 indicates a specific host address (Optional) generates a log entry on the router for each packet that matches this statement 10 Breakdown of an Extended ACL Statement protocol icp, icmp, tcp, udp, ip, etc. autonomous number 100 to 199 source wildcard mask destination wildcard mask access-list 125 permit ip 192.168.90.36 0.0.0.0 192.175.63.12 0.0.0.0 permit or deny source address destination address autonomous number 100 to 199 protocol icp, icmp, tcp, udp, ip, etc. port number (23 = telnet) indicates a specific host destination address access-list 178 deny tcp host 192.168.90.36 host 192.175.63.12 eq 23 log permit or deny source address indicates a specific host operator eq for = gt for > lt for < neg for = (Optional) generates a log entry on the router for each packet that matches this statement Protocols Include: (Layers 3 and 4) IP IGMP IPINIP TCP GRE OSPF UDP IGRP NOS ICMP EIGRP Integer 0-255 To match any internet protocol use IP. 11 What are Named Access Control Lists? Named ACLs... ...are standard or extended ACLs which have an alphanumeric name instead of a number. (ie. 1-99 or 100-199) Named Access Lists Information Named Access Lists... ...identify ACLs with an intuutive name instead of a number. ...eliminate the limits imposed by using numbered ACLs. (798 for standard and 799 for extended) ...provide the ability to modify your ACLs without deleting and reloading the revised access list. It will only allow you to add statements to the end of the exsisting statements. ...are not compatable with any IOS prior to Release 11.2. ...can not repeat the same name on multiple ACLs. Applying a Standard Named Access List called “George” Write a named standard access list called “George” on Router A, interface E1 to block Melvin’s computer from sending information to Kathy’s computer; but will allow all other traffic. Place the access list at: Router Name: Router A Interface: E1 Access-list Name: George [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#ip access-list standard George Router(config-std-nacl)# deny host 72.16.70.35 Router(config-std-nacl)# permit any Router(config-std-nacl)# interface e1 Router(config-if)# ip access-group George out Router(config-if)# exit Router(config)# exit 12 Applying an extended Named Access List called “Gracie” Write a named extended access list called “Gracie” on Router A, Interface E0 called “Gracie” to deny HTTP traffic intended for web server 192.168.207.27, but will permit all other HTTP traffic to reach the only the 192.168.207.0 network. Deny all other IP traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: E0 Access-list Mail: Gracie [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#ip access-list extended Gracie Router(config-ext-nacl)# deny tcp any host 192.168.207.27 eq www Router(config-ext-nacl)# permit tcp any 192.168.207.0 0.0.0.255 eq www Router(config-ext-nacl)# interface e0 Router(config-if)# ip access-group Gracie in Router(config-if)# exit Router(config)# exit 13 Choices for Using Wildcard Masks Wildcard masks are usually set up to do one of four things: 1. Match a specific host. 2. Match an entire subnet. 3. Match a specific range. 4. Match all addresses. 1. Matching a specific host. For standard access lists: Access-List 10 permit 192.168.150.50 0.0.0.0 or Access-List 10 permit 192.168.150.50 (standard ACL’s mask) assume a 0.0.0.0 or Access-List 10 permit host 192.168.150.50 For extended access lists: Access-list 110 deny ip 192.168.150.50 0.0.0.0 any or Access-list 110 deny ip host 192.168.150.50 any 2. Matching an entire subnet Example 1 Address: 192.168.50.0 Subnet Mask: 255.255.255.0 Access-list 25 deny 192.168.50.0 0.0.0.255 Example 2 Address: 172.16.0.0 Subnet Mask: 255.255.0.0 Access-list 12 permit 172.16.0.0 0.0.255.255 Example 3 Address: 10.0.0.0 Subnet Mask: 255.0.0.0 Access-list 125 deny udp 10.0.0.0 0.255.255.255 any 14 3. Match a specific range Example 1 Address: 10.250.50.112 Subnet Mask: 255.255.255.224 255. 255. 255. 255 Custom Subnet mask: -255. 255. 255. 224 Wildcard: 0. 0. 0. 31 Access-list 125 permit udp 10.250.50.112 0.0.0.31 any e Example 2 Address Range: 192.168.16.0 to 192.168.16.127 192. 168. 16.127 -192. 168. 16. 0 0. 0. 0.127 Wildcard: Access-list 125 deny ip 192.168.16.0 0.0.0.127 any (This ACL would block the lower half of the subnet.) Example 3 Address: 172.250.16.32 to 172.250.31.63 172. 250. 31. 63 -172. 250. 16. 32 0. 0. 15. 31 Wildcard: Access-list 125 permit ip 172.250.16.32 0.0.15.31 any 4. Match everyone. For standard access lists: Access-List 15 permit any or Access-List 15 deny 0.0.0.0 255.255.255.255 For extended access lists: Access-List 175 permit ip any any or Access-List 175 deny tcp 0.0.0.0 255.255.255.255 any 15 Creating Wildcard Masks Just like a subnet mask the wildcard mask tells the router what part of the address to check or ignore. Zero (0) must match exactly, one (1) will be ignored. The source address can be a single address, a range of addresses, or an entire subnet. As a rule of thumb the wildcard mask is the reverse of the subnet mask. Example #1: IP Address and subnet mask: IP Address and wildcard mask: 204.100.100.0 255.255.255.0 204.100.100.0 0.0.0.255 All zero’s (or 0.0.0.0) means the address must match exactly. Example #2: 10.10.150.95 0.0.0.0 (This address must match exactly.) One’s will be ignored. Example #3: 10.10.150.95 0.0.0.255 (Any 10.10.150.0 subnet address will match. 10.10.150.0 to 10.10.150.255) This also works with subnets. Example #4: IP Address and subnet mask: IP Address and wildcard mask: 192.170.25.30 255.255.255.224 192.170.25.30 0.0.0.31 (Subtract the subnet mask from 255.255.255.255 to create the wildcard) (This is the inverse of the subnet mask.) Do the math... 255 - 255 = 0 255 - 224 = 31 Example #5: IP Address and subnet mask: IP Address and wildcard mask: 172.24.128.0 255.255.128.0 172.24.128.0 0.0.127.255 Do the math... 255 - 255 = 0 (This is the inverse of the subnet mask.) 255 - 128 = 127 255 - 0 = 255 16 Wildcard Mask Problems 1. Create a wildcard mask to match this exact address. IP Address: 192.168.25.70 0.0.0.0 Subnet Mask: 255.255.255.0 ___________________________________ Create a wildcard mask to match this range. IP Address: 210.150.10.0 0 . 0 . 0 . 255 Subnet Mask: 255.255.255.0 ___________________________________ Create a wildcard mask to match this host. IP Address: 195.190.10.35 Subnet Mask: 255.255.255.0 __________________________________ Create a wildcard mask to match this range. IP Address: 172.16.0.0 Subnet Mask: 255.255.0.0 __________________________________ Create a wildcard mask to match this range. IP Address: 10.0.0.0 Subnet Mask: 255.0.0.0 __________________________________ Create a wildcard mask to match this exact address. IP Address: 165.100.0.130 Subnet Mask: 255.255.255.192 __________________________________ Create a wildcard mask to match this range. IP Address: 192.10.10.16 Subnet Mask: 255.255.255.224 __________________________________ Create a wildcard mask to match this range. IP Address: 171.50.75.128 Subnet Mask: 255.255.255.192 __________________________________ Create a wildcard mask to match this host. IP Address: 10.250.30.2 Subnet Mask: 255.0.0.0 __________________________________ Create a wildcard mask to match this range. IP Address: 210.150.28.16 Subnet Mask: 255.255.255.240 __________________________________ Create a wildcard mask to match this range. IP Address: 172.18.0.0 Subnet Mask: 255.255.224.0 __________________________________ Create a wildcard mask to match this range. IP Address: 135.35.230.32 Subnet Mask: 255.255.255.248 __________________________________ 17 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Wildcard Mask Problems Based on the given information list the total number of source addresses for each access list statement. 1. access-list 10 permit 192.168.150.50 0.0.0.0 192.168.150.50 Answer: __________________________________________________________________ 2. access-list 5 permit any Any address Answer: __________________________________________________________________ 3. access-list 125 deny tcp 195.223.50.0 0.0.0.63 host 172.168.10.1 fragments 195.223.50.0 to 195.223.50.63 Answer: __________________________________________________________________ 4. access-list 11 deny 210.10.10.0 0.0.0.255 Answer: __________________________________________________________________ 5. access-list 108 deny ip 192.220.10.0 0.0.0.15 172.32.4.0 0.0.0.255 Answer: __________________________________________________________________ 6. access-list 171 deny any host 175.18.24.10 fragments Answer: __________________________________________________________________ 7. access-list 105 permit 192.168.15.0 0.0.0.255 any Answer: __________________________________________________________________ 8. access-list 109 permit tcp 172.16.10.0 0.0.0.255 host 192.168.10.1 eq 80 Answer: __________________________________________________________________ 9. access-list 111 permit ip any any Answer: __________________________________________________________________ 10. access-list 195 permit udp 172.30.12.0 0.0.0.127 172.50.10.0 0.0.0.255 Answer: __________________________________________________________________ 18 11. access-list 110 permit ip 192.168.15.0 0.0.0.3 192.168.30.10 0.0.0.0 Answer: _________________________________________________________________ 12. access-list 120 permit ip 192.168.15.0 0.0.0.7 192.168.30.10 0.0.0.0 Answer: _________________________________________________________________ 13. access-list 130 permit ip 192.168.15.0 0.0.0.15 192.168.30.10 0.0.0.0 Answer: _________________________________________________________________ 14. access-list 140 permit ip 192.168.15.0 0.0.0.31 192.168.30.10 0.0.0.0 Answer: _________________________________________________________________ 15. access-list 150 permit ip 192.168.15.0 0.0.0.63 192.168.30.10 0.0.0.0 Answer: _________________________________________________________________ 16. access-list 101 Permit ip 192.168.15.0 0.0.0.127 192.168.30.10 0.0.0.0 Answer:__________________________________________________________________ 17. access-list 185 permit ip 192.168.15.0 0.0.0.255 192.168.30.0 0.0.0.255 Answer: _________________________________________________________________ 18. access-list 160 deny udp 172.16.0.0 0.0.1.255 172.18.10.18 0.0.0.0 gt 22 Answer: _________________________________________________________________ 19. access-list 195 permit icmp 172.85.0.0 0.0.15.255 172.50.10.0 0.0.0.255 Answer: _________________________________________________________________ 20. access-list 10 permit 175.15.120.0 0.0.0.255 Answer: _________________________________________________________________ 21. access-list 190 permit tcp 192.15.10.0 0.0.0.31 any Answer: _________________________________________________________________ 22. access-list 100 permit ip 10.0.0.0 0.255.255.255 172.50.10.0 0.0.0.255 Answer: _________________________________________________________________ 19 Wildcard Mask Problems Based on the given information list the total number of destination addresses for each access list statement. 1.access-list 125 deny tcp 195.223.50.0 0.0.0.63 host 172.168.10.1 fragments 172.168.10.1 Answer: __________________________________________________________________ 2. access-list 115 permit any any Any address Answer: __________________________________________________________________ 3. access-list 150 permit ip 192.168.30.10 0.0.0.0 192.168.15.0 0.0.0.63 192.168.15.0 to 192.168.15.63 Answer: __________________________________________________________________ 4. access-list 120 deny tcp 172.32.4.0 0.0.0.255 192.220.10.0 0.0.0.15 Answer: __________________________________________________________________ 5. access-list 108 deny ip 192.220.10.0 0.0.0.15 172.32.4.0 0.0.0.255 Answer: __________________________________________________________________ 6. access-list 101 deny ip 140.130.110.100 0.0.0.0 0.0.0.0 255.255.255.255 Answer: __________________________________________________________________ 7. access-list 105 permit any 192.168.15.0 0.0.0.255 Answer: __________________________________________________________________ 8. access-list 120 permit ip 192.168.15.10 0.0.0.0 192.168.30.0 0.0.0.7 Answer: __________________________________________________________________ 9. access-list 160 deny udp 172.16.0.0 0.0.1.255 172.18.10.18 0.0.0.0 eq 21 Answer: __________________________________________________________________ 10. access-list 150 permit ip 192.168.15.10 0.0.0.0 192.168.30.0 0.0.0.63 Answer: __________________________________________________________________ 20 Writing Standard Access Lists... Router A 192.168.90.2 172.16.70.1 E1 E0 S0 210.30.28.0 Jim’s Network Computer 192.168.90.36 172.16.70.32 Frank’s Computer Melvin’s Computer Kathy’s Computer 192.168.90.38 172.16.70.35 Standard Access List Sample #1 Write a standard access list to block Melvin’s computer from sending information to Kathy’s computer; but will allow all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: E1 Access-list #: 10 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 10 deny 172.16.70.35 or access-list 10 deny 172.16.70.35 0.0.0.0 or access-list 10 deny host 172.16.70.35 Router(config)# access-list 10 permit 0.0.0.0 255.255.255.255 or access-list 10 permit any Router(config)# interface e1 Router(config-if)# ip access-group 10 out Router(config-if)# exit Router(config)# exit [Viewing information about existing ACL’s] Router# show configuration Router# show access list 10 (This will show which access groups are associated with particular interfaces) (This will show detailed information about this ACL) 22 Standard Access List Sample #2 Write a standard access list to block Jim’s computer from sending information to Frank’s computer; but will allow all other traffic from the 192.168.90.0 network. Permit all traffic from the 210.30.28.0 network to reach the 172.16.70.0 network. Deny all other traffic. Include a remark with each statement of your ACL. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: E0 Access-list #: 28 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 28 remark Block Jim from reaching Frank Router(config)# access-list 28 deny 192.168.90.36 or access-list 28 deny 192.168.90.36 0.0.0.0 or access-list 28 deny host 192.168.90.36 Router(config)# access-list 28 remark Allow all other traffic Router(config)# access-list 28 permit 192.168.90.0 0.0.0.255 Router(config)# access-list 28 remark Allow all traffic Router(config)# access-list 28 permit 210.30.28.0 0.0.0.255 Router(config)# interface e0 Router(config-if)# ip access-group 28 out Router(config-if)# exit Router(config)# exit Router# copy run start [Remark Command] The remark command allows you to place text within the ACL so it can be viewed after it is inserted on the router. It can be viewed using the show run or any command that lists the ACL. [Disabling ACL’s] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 28 out Router(config-if)# exit Router(config)# exit [Removing an ACL] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 28 out Router(config-if)# exit Router(config)# no access-list 28 Router(config)# exit 23 FA0 S0 223.190.32.1 Router A S1 Router B FA1 192.16.32.94 FA0 Michael’s Computer 223.190.32.16 172.16.0.0 Network Debbie’s Computer 192.16.32.95 Standard Access List Problem #1 Write a standard access list to block Debbie’s computer from receiving information from Michael’s computer; but will allow all other traffic. List all the command line options for this problem. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ or ________________________________________________________ or ________________________________________________________ Router(config)# ________________________________________________________ or ______________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 24 Standard Access List Problem #2 Write a standard access list to permit Debbie’s computer to receive information from Michael’s computer; but will deny all other traffic from the 223.190.32.0 network. Block all traffic from the 172.16.0.0 network. Permit all other traffic. List all the command line options for this problem. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ or ________________________________________________________ or ________________________________________________________ Router(config)#_________________________________________________________ Router(config)#_________________________________________________________ Router(config)#_________________________________________________________ or _______________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 25 Router A 204.90.30.124 E0 S0 10.250.30.35 Router B FA1 192.168.88.4 Jim’s Computer Carol’s Computer Rodney’s Computer S1 10.250.30.36 192.168.88.5 204.90.30.130 204.90.30.126 Standard Access List Problem #3 Write a standard access list to block Rodney and Carol’s computer from sending information to Jim’s computer; but will allow all other traffic from the 204.90.30.0 network. Block all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 26 Standard Access List Problem #4 Using a minimum number of commands write a standard access list named “Ralph” to block Carol’s computer from sending information to Jim’s computer; but will permit Jim to receive data from Rodney. Block the upper half of the 204.90.30.0 range from reaching Jim’s computer while permitting the lower half of the range. Block all other traffic. Include a remark with each statement of your ACL. For help with blocking the upper half of the range review page 13 or the wildcard mask problems on pages 16 and 17. For help with named ACLs review pages 12 and 13. For help with the remark command review page 23. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ Router(config-std-nacl)# _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ Router(config-std-nacl)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 27 Router B S0 S1 Router A 172.30.225.1 E0 S0 S1 E1 212.180.10.5 S1 Router C 212.180.10.6 212.180.10.2 172.30.225.2 172.30.225.3 Standard Access List Problem #5 Write a standard access list to block 172.30.225.2 and 172.30.225.3 from sending information to the 212.180.10.0 network; but will allow all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 28 Standard Access List Problem #6 Write a standard access list to block and log 212.180.10.2 from sending information to the 172.30.225.0 network. Permit and log 212.180.10.6 to send data to the 172.30.225.0 network. Deny all other traffic. Add a remark to each statement explaining its purpose. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Check the example on page 10 for help with the logging option. For help with the remark command review page 23. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 29 Router A S0 S1 FA0 192.168.15.172 Router C S1 Router B S0 210.140.15.1 FA1 198.32.10.25 FA0 192.168.15.3 210.140.15.8 198.32.10.25 Standard Access List Problem #7 Write a standard access list to block the addresses 192.168.15.1 to 192.168.15.31 from sending information to the 210.140.15.0 network. Do not permit any traffic from 198.32.10.25 to reach the 210.140.15.0 network. Permit all other traffic. For help with this problem review page 13 or the wildcard mask problems on pages 16 and 17. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 30 Standard Access List Problem #8 Write a standard named access list called “Cisco_Lab_A” to permit traffic from the lower half of the 198.32.10.0 network to reach 192.168.15.0 network; block the upper half of the addresses. Allow host 198.32.10.192 to reach network 192.168.15.0. Permit all other traffic. For help with this problem review page 13 or the wildcard masks problems on pages 16 and 17. For assistance with named ACLs review pages 12 and 13. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ Router(config-std-nacl)# _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ Router(config-std-nacl)# interface ________ Router(config-if)# ip access-group __________________ in or out (circle one) Router(config-if)# exit Router(config)# exit 31 Standard Access List Problem #9 Write a standard access list to block network 192.168.255.0 from receiving information from the following addresses: 10.250.1.1, 10.250.2.1, 10.250.4.1, and the entire 10.250.3.0 255.255.255.0 network. Allow all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router A Router Name: ___________________________ FA0 Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ FA0 Router(config)# interface ________ Router(config-if)# ip access-group ________ in or out (circle one) Router(config-if)# exit Router(config)# exit 32 Writing Extended Access Lists... 34 Gail’s Computer Mike’s Computer Router A 192.168.90.2 172.16.70.1 FA1 FA0 John’s Computer 172.16.70.32 192.168.90.36 Celeste’s Computer 172.16.70.35 192.168.90.38 Extended Access List Sample #1 Deny/Permit Specific Addresses Write an extended access list to prevent John’s computer from sending information to Mike’s computer; but will allow all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: FA0 Access-list #: 110 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 110 deny ip 172.16.70.35 0.0.0.0 192.168.90.36 0.0.0.0 or access-list 110 deny ip host 172.16.70.35 host 192.168.90.36 Router(config)# access-list 110 permit ip any any or access-list 110 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface fa0 Router(config-if)# ip access-group 110 in [Viewing information about existing ACL’s] Router(config-if)# exit Router# show configuration (This will show which access groups are associated with particular interfaces) Router(config)# exit Router# show access list 110 (This will show detailed information about this ACL) Extended Access List Sample #2 Deny/Permit Specific Addresses Write an extended access list to block the 172.16.70.0 network from receiving information from Mike’s computer at 192.168.90.36. Block the lower half of the ip addresses from 192.168.90.0 network from reaching Gail’s computer at 172.16.70.32. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: FA1 Access-list #: 135 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 135 deny ip 192.168.90.36 0.0.0.0 172.16.70.0 0.0.0.255 or access-list 135 deny ip host 192.168.90.36 172.16.70.0 0.0.0.255 Router(config)# access-list 135 deny ip 192.168.90.0 0.0.0.127 172.16.70.32 0.0.0.0 or access-list 135 deny ip 192.168.90.0 0.0.0.127 host 172.16.70.32 Router(config)# access-list 135 permit ip any any or access-list 135 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface fa1 Router(config-if)# ip access-group 135 in Router(config-if)# exit Router(config)# exit Router# copy run start [Removing an ACL] Router# configure terminal Router(config)# interface e1 Router(config-if)# no ip access-group 135 out Router(config-if)# exit Router(config)# no access-list 135 Router(config)# exit [Disabling ACL’s] Router# configure terminal Router(config)# interface e1 Router(config-if)# no ip access-group 135 out Router(config-if)# exit Router(config)# exit 35 36 Router A S0 FA0 172.20.70.15 Jay’s Computer Router B FA1 S1 192.168.122.52 Cindy’s Computer Bob’s Computer 172.20.70.89 192.168.122.128 Jackie’s Computer 172.20.70.80 192.168.122.129 Extended Access List Problem #1 Deny/Permit Specific Addresses Write an extended access list to prevent Jay’s computer from receiving information from Cindy’s computer. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start Extended Access List Problem #2 Deny/Permit Specific Addresses Write an extended access list to block the 172.20.70.0 255.255.255.0 network from receiving information from Jackie’s computer at 192.168.122.129. Block the lower half of the ip addresses from 192.168.122.0 network from reaching Cindy’s computer at 172.20.70.89. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)# _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 37 Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start Router A E0 218.35.50.1 S0 S1 Rebecca’s Computer 38 Juan’s Computer 218.35.50.12 Router B FA1 172.59.2.1 172.59.2.15 Jan’s Computer Rachael’s Computer 218.35.50.10 172.59.2.18 Extended Access List Problem #3 Deny/Permit Specific Addresses Write a named extended access list called “Lab_166” to permit Jan’s computer at 218.35.50.10 to receive packets from Rachael’s computer at 172.59.2.18; but not Rebecca’s computer at 172.59.2.15. Deny all other packets. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#_____________________________________________________________________________________ Router(config-ext-nacl) ___________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ Router(config-ext-nacl)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Extended Access List Problem #4 Deny/Permit Specific Addresses Write an extended access list to allow Juan’s computer at 218.35.50.12 to send information to Rebecca’s computer at 172.59.2.15; but not Rachael’s computer at 172.59.2.18. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)# _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router((config-if)# exit Router(config)# exit Router# copy run start 39 40 Router A S0 E0 E1 192.18.50.11 192.17.40.0 Network Bob’s Computer Router B S1 Ralph’s Computer Cindy’s Computer 192.16.20.7 192.16.20.6 192.16.20.0 Network Barbra’s Computer 192.18.50.12 Extended Access List Sample #3 Deny/Permit Entire Ranges Write an extended access list to permit the 192.16.20.0 network to receive packets from the 192.18.50.0 network. Deny all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router B Interface: E1 Access-list #: 111 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 111 permit ip 192.18.50.0 0.0.0.255 192.168.20.0 0.0.0.255 Router(config)# access-list 111 deny ip any any or access-list 111 deny ip 0.0.0.0 255.255.255.2550.0.0.0 255.255.255.255 Router(config)# interface e1 Router(config-if)# ip access-group 111 in Router(config-if)# exit Router(config)# exit [Viewing information about existing ACL’s] Router# show configuration Router# show access list 111 (This will show which access groups are associated with particular interfaces) (This will show detailed information about this ACL) Extended Access List Sample #4 Deny/Permit Entire Ranges Write an extended access list to block the 192.18.50.0 network from receiving information from the 192.16.20.0 network. Permit all other traffic. Add a remark to each statement. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. [Remark Command] The remark command allows you to place text within the ACL so it can be viewed after it is inserted on the router. It can be viewed using the show run or any command that lists the ACL. Place the access list at: Router Name: Router A Interface: E0 Access-list #: 188 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 188 remark block all traffic from the Science lab Router(config)# access-list 188 deny ip 192.16.20.0 0.0.0.255 192.18.50.0 0.0.0.255 Router(config)# access-list 188 remark allow everyone else unrestricted access Router(config)# access-list 188 permit ip any any or access-list 188 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface e0 Router(config-if)# ip access-group 188 in Router(config-if)# exit Router(config)# exit Router# copy run start [Removing an ACL] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 188 out Router(config-if)# exit Router(config)# no access-list 188 Router(config)# exit [Disabling ACL’s] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 188 out Router(config-if)# exit Router(config)# exit 41 42 Router A S0 FA0 210.250.10.0 Network S0 Rebecca’s Computer 204.95.150.11 S1 172.59.2.15 Router B FA1 172.59.2.1 Todd’s Computer Rachel’s Computer 204.95.150.12 David’s Computer 204.95.150.10 172.59.2.18 Extended Access List Problem #5 Deny/Permit Entire Ranges Write an extended access list to permit network 204.95.150.0 to send packets to network 172.59.0.0, but not to the 210.250.10.0 network. Permit all other traffic. Include a remark with each statement of your ACL. For help with the remark command review page 41. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Extended Access List Problem #6 Deny/Permit Entire Ranges Write an extended access list to allow Rachel’s computer at 204.95.150.10 to receive information from the 172.59.2.0 network. Deny all other hosts on the 204.95.150.0 network access from the 172.59.2.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)#______________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 43 Router A S0 E0 Router B S1 E1 192.168.50.2 S0 Tim’s Computer Denise’s Computer 44 172.120.170.47 E1 Tommy’s Computer Phyllis’s Computer 172.120.170.46 210.168.70.0 Network 192.168.50.3 172.120.170.45 10.250.1.0 Network 192.168.50.4 Extended Access List Problem #7 Deny/Permit Entire Ranges Write a named extended access list called “Godzilla” to prevent the 172.120.0.0 network from sending information to the 210.168.70.0 , and 10.250.1.0 255.255.255.0 networks; but will permit traffic to the 192.168.50.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# _____________________________________________________________________________________ Router(config-ext-nacl)#_____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Router(config-ext-nacl)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Extended Access List Problem #8 Deny/Permit Entire Ranges Assuming default subnet masks write an extended access list to permit Tim at 192.168.50.3 to receive data from the 172.120.0.0 network. Allow the 192.168.50.0 network to receive information from Phyllis’s computer at 172.120.170.45. Deny all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)# _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 45 46 Jim’s Computer Router A S0 FA0 192.168.15.20 S1 E1 172.21.50.95 Carol’s Computer Router B Rodney’s Computer 192.168.15.43 172.21.50.96 Frank’s Computer 192.168.15.44 172.21.50.97 Extended Access List Sample #5 Deny/Permit a Range of Addresses Write an extended access list to deny the first 15 usable addresses of the 192.168.15.0 network from reaching the 172.21.0.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: FA0 Access-list #: 185 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 185 deny ip 192.168.15.0 0.0.0.15 172.21.50.0 0.0.255.255 Router(config)# access-list 185 permit ip any any or access-list 185 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface fa1 Router(config-if)# ip access-group 185 in Router(config-if)# exit [Viewing information about existing ACL’s] Router(config)# exit Router# show configuration (This will show which access groups are associated with particular interfaces) Router# show access list 185 (This will show detailed information about this ACL) Extended Access List Sample #6 Deny/Permit a Range of Addresses Write an extended access list which will allow the lower half of 192.168.15.0 network access to the 172.21.50.0 network. Deny all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: FA0 Access-list #: 121 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 121 permit ip 192.168.15.0 0.0.0.127 172.21.50.0 0.0.0.255 Router(config)# access-list 121 deny ip any any or access-list 121 deny ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface fa0 Router(config-if)# ip access-group 121 in Router(config-if)# exit Router(config)# exit Router# copy run start [Disabling ACL’s] [Removing an ACL] Router# configure terminal Router(config)# interface fa0 Router(config-if)# no ip access-group 121 in Router(config-if)# exit Router(config)# no access-list 121 Router(config)# exit Router# configure terminal Router(config)# interface fa0 Router(config-if)# no ip access-group 121 in Router(config-if)# exit Router(config)# exit 47 Router A 192.168.195.90 E0 S0 Mike’s Computer Gail’s Computer 48 192.168.125.254 E1 John’s Computer 192.168.195.145 192.168.125.17 172.31.195.0 Network Celeste’s Computer 192.168.195.88 192.168.125.108 Extended Access List Problem #9 Deny/Permit a Range of Addresses Write an extended access list to prevent the first 31 usable addresses in the 192.168.125.0 network from reaching the 192.168.195.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Extended Access List Problem #10 Deny/Permit a Range of Addresses Write a named extended access list called “Media_Center” to permit the range of addresses from 172.31.195.1 through 172.31.195.7 to send data to the 192.168.125.0 network. Deny all other traffic. Include a remark with each statement of your ACL. For help with the remark command review page 41. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)#______________________________________________________________________________________ Router(config-ext-nacl)#_____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Router(config-ext-nacl)# interface __________ Router(config-if)# ip access-group ________________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 49 192.16.20.5 FA0 S0 S1 S0 E1 172.22.75.8 172.22.75.10 Brad’s Computer Router A Router C S1 FA1 172.18.50.10 Jill’s Computer Bob’s 172.22.75.9 Computer 172.18.50.11 Barbra’s Computer 50 Ralph’s Computer Router B Cindy’s Computer 192.16.20.7 192.16.20.6 172.18.50.12 Extended Access List Problem #11 Deny/Permit a Range of Addresses Write an extended access list to permit the first 3 usable addresses in the 192.16.20.0 network to reach the 172.22.75.0 network. Deny the addresses from 192.16.20.4 through 192.16.20.31 from reaching the 172.22.75.0 network. Permit all other traffic. Keep in mind that there are multiple ways this ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Extended Access List Problem #12 Deny/Permit a Range of Addresses Write an extended access list to deny the addresses from 172.22.75.8 through 172.22.75.127 from sending data to the 172.18.50.0 network. Deny the first half of the addresses from the 172.22.75.0 network from reaching the 192.16.20.0 network. Permit all other traffic. Keep in mind that there are multiple ways this ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)#______________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 51 52 Router A S0 FA0 172.16.70.1 FA1 Peggy’s Computer Router B FA1 S1 192.168.88.1 FA0 Denise’s Computer Bob’s Computer Celeste’s Computer 172.16.70.155 10.250.1.0 Network 10.250.4.0 192.168.88.200 Network 172.16.70.145 192.168.88.204 Extended Access List Problem #13 Deny/Permit a Range of Addresses Write an extended access list to permit the first 63 usable addresses in the 192.168.88.0 network to reach the lower half of the addresses in the 172.16.70.0 network; but not the upper half. Deny all other traffic. Include a remark with each statement of your ACL. For help with the remark command review page 41. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Extended Access List Problem #14 Deny/Permit a Range of Addresses Write an extended access list to deny the addresses from 10.250.1.0 through 10.250.1.63 from sending data to Denise’s computer. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)#______________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 53 54 Web Server Router A S0 E0 192.168.207.25 Web Server 192.168.207.27 Router B S1 E1 210.128.50.10 210.128.50.11 210.128.50.12 192.168.207.26 Extended Access List Sample #7 Deny/Permit Port Numbers Write an extended access list to deny HTTP traffic intended for web server 192.168.207.27 from all other networks, but will permit all other HTTP traffic to reach the 192.168.207.0 network. Deny all other IP traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: E0 Access-list #: 198 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 198 deny tcp any 192.168.207.27 0.0.0.0 eq www or access-list 198 deny tcp any host 192.168.207.27 eq www Router(config)# access-list 198 permit tcp any 192.168.207.0 0.0.0.255 eq www Router(config)# interface e 0 Router(config-if)# ip access-group 198 in Router(config-if)# exit Router(config)# exit [Viewing information about existing ACL’s] Router# show configuration Router# show access list 198 (This will show which access groups are associated with particular interfaces) (This will show detailed information about this ACL) Extended Access List Sample #8 Deny/Permit Port Numbers Write an extended access list to deny pings from hosts on the 210.128.50.0 network from reaching the 192.168.207.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router B Interface: E1 Access-list #: 134 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 134 deny icmp 210.128.50.0 0.0.0.255 192.168.207.0 0.0.0.255 Router(config)# access-list 134 permit icmp any any Router(config)# interface e1 Router(config-if)# ip access-group 134 in Router(config-if)# exit Router(config)# exit Router# copy run start [Disabling ACL’s] [Removing an ACL] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 134 out Router(config-if)# exit Router(config)# no access-list 134 Router(config)# exit Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 134 out Router(config-if)# exit Router(config)# exit 55 56 10.250.4.0 Network 172.20.70.1 E0 E1 S0 Router A 172.16.16.0 192.168.33.210 Network Peggy’s Computer Router B E1 S1 192.168.33.1 E0 Denise’s Computer Bob’s Computer Celeste’s Computer 192.30.76.155 192.30.76.145 192.168.33.214 Extended Access List Sample #9 Deny/Permit Port Numbers Write an Extended access list to permit Denise’s computer to use TFTP with Bob’s computer. Deny all other traffic from the 192.168.33.0 network to the 192.30.76.0 network. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router B Interface: E1 Access-list #: 145 [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 145 permit udp192.168.33.214 0.0.0.0 192.30.76.155 0.0.0.0 eq tftp or access-list 145 permit udp host 192.168.33.214 host 192.30.76.155 eq tftp Router(config)# interface E1 Router(config-if)# ip access-group 145 in Router(config-if)# exit Router(config)# exit [Viewing information about existing ACL’s] Router# show configuration Router# show access list 45 (This will show which access groups are associated with particular interfaces) (This will show detailed information about this ACL) Extended Access List Sample #10 Deny/Permit Port Numbers Write an extended access list to deny FTP traffic from ip addresses 192.30.76.0 through 192.30.76.13. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router A Interface: E0 Access-list #: 155 [Writing and installing an ACL] Router# configure terminal Router(config)# access-list 155 deny tcp 192.30.76.0 0.0.0.8 any eq ftp (Covers 0 to 7) Router(config)# access-list 155 deny tcp 192.30.76.8 0.0.0.4 any eq ftp (Covers 8 to 11) Router(config)# access-list 155 deny tcp 192.30.76.12 0.0.0.1 any eq ftp (Covers 12 to 13) Router(config)# access-list 155 permit tcp any any or access-list 155 deny tcp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 Router(config)# interface e0 Router(config-if)# ip access-group 155 in Router(config-if)# exit Router(config)# exit Router# copy run start [Removing an ACL] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 155 out Router(config-if)# exit Router(config)# no access-list 155 Router(config)# exit [Disabling ACL’s] Router# configure terminal Router(config)# interface e0 Router(config-if)# no ip access-group 155 out Router(config-if)# exit Router(config)# exit 57 58 10.250.2.0 Network Router B FA1 S1 192.128.45.8 FA0 Bill’s Computer E1 E0 172.16.70.1 192.128.45.33 Router A 10.250.8.0 Network S0 Jackie’s Computer Jennifer’s Computer 172.16.125.1 192.128.45.35 Extended Access List Problem #15 Deny/Permit a Port Numbers Write an extended access list to permit ICMP traffic from the 192.128.45.0 network to reach the 172.16.125.0 255.255.255.0 and 10.250.2.0 255.255.255.0 networks. Deny all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Extended Access List Problem #16 Deny/Permit a Port Numbers Write a named extended access list called “Peggys_Lab” to deny telnet from 10.250.8.0 through 10.250.8.127 from reaching the 192.128.45.0 network. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list Name: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ Router(config-std-nacl)# ____________________________________________________________________________ Router(config-std-nacl)# ____________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ Router(config-ext-nacl)# interface __________ Router(config-if)# ip access-group _________________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start Router# copy run start 59 60 Router A S0 FA0 204.250.10.0 Network S0 Jimmy’s Computer Jo’s Computer 203.194.100.1 S1 Router B 172.60.18.140 FA1 172.60.18.1 Web Server #1 Web Server #2 203.194.100.102 203.194.100.101 172.60.18.142 Extended Access List Problem #17 Deny/Permit Port Numbers Write an access list to deny Jimmy’s computer from sending ftp packets to Web Server 1, but permit ftp to Web Server #2. Permit all other traffic. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Extended Access List Problem #18 Deny/Permit Port Numbers Write an extended access list to deny all HTTP traffic intended for the web server at 203.194.100.102 from the 172.66.0.0 network. Permit all other HTTP traffic from the 204.250.10.0 and 172.60.0.0 networks to any other web servers. Deny all other IP traffic to the 203.194.100.0 network. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 61 62 Bobbie’s Computer Router A S0 E0 E1 192.168.15.25 S1 E1 Web Server #2 172.23.50.195 172.23.50.196 Router B 192.172.10.0 Network Gail’s Computer Web Server #1 192.168.15.125 192.168.15.82 172.23.50.197 Extended Access List Problem #19 Deny/Permit Port Numbers Write an extended access list to permit TFTP traffic from all hosts on the 192.168.15.0 network. Deny all other traffic. Include a remark with each statement of your ACL. For help with the remark command review page 41.Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# interface ____________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Extended Access List Problem #20 Deny/Permit Port Numbers Write an extended access list that permits web traffic from web server #2 at 172.23.50.196 to reach everyone on the 192.168.15.0 network. Deny all other IP traffic going to the 192.172.10.0, and 192.168.15.0 networks from the 172.25.50.0 network. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal Router(config)#______________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Router(config)# interface __________ Router(config-if)# ip access-group _________ in or out (circle one) Router(config-if)# exit Router(config)# exit Router# copy run start 63 Writing Access Lists to Restrict Telnet Access... Restricting access to telnet can be a very usefull option. Telnet is considered a very insecure protocol because it sends passwords through the network in clear-text. By switching from the access-group command to the access-class command you can increase your security by allowing only those users through that you want to use telnet. The access-class command also allows you to apply this access list to the vty connections. Router A S0 E0 172.20.70.1 E1 Peggy’s Computer Router B E1 S1 192.168.33.1 E0 172.16.16.0 192.168.33.210 Network Denise’s Computer Bob’s Computer Celeste’s Computer 192.30.76.155 10.250.4.0 Network 192.30.76.145 192.168.33.214 Standard Access List Sample #11 Deny/Permit Telnet Write a standard access list to permit Denise’s and Bob’s computers to telnet into Router B. Deny all other telnet traffic Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: Router B Interface: line VTY 0 4 Access-list #: 45 (using line VTY 0 4 instead of an interface like E1 allows you to apply this access list to all VTY lines with one statement) [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)# access-list 45 permit 192.168.33.214 0.0.0.0 or access-list 45 permit host 192.168.33.214 Router(config)# access-list 45 permit 192.30.76.155 0.0.0.0 or access-list 45 permit host 192.30.76.155 Router(config)# line vty 0 4 Router(config-line)#access-class 45 in Router(config-line)# exit [Viewing information about existing ACL’s] Router(config)# exit Router# show configuration (This will show which access groups are associated with particular interfaces) Router# show access list 45 (This will show detailed information about this ACL) 65 66 Router A S0 FA0 203.194.100.1 S0 Becky’s Computer Router B S1 FA1 172.60.18.1 Web Server #1 Web Server #2 203.194.100.102 172.60.18.140 204.250.10.0 Network 203.194.100.101 Mary’s Computer 172.60.18.142 Access List Problem #21 Deny/Permit Telnet Write a standard access list to permit Becky and Mary’s computer to telnet into Router B. Deny all other telnet traffic from the 172.60.18.0 network. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# ___________________ Router(config-line)# access-class _________ in or out (circle one) Router(config-line)# exit Router(config)# exit Access List Problem #22 Deny/Permit Telnet Write a standard access list to permit which will permit Web Server #1 to telnet into Router A. Log the telnet attempts. Deny all other telnet access. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# ___________________ Router(config-line)# access-class _________ in or out (circle one) Router(config-line)# exit Router(config)# exit 67 Router A FA0 172.32.0.0 Network 192.60.18.61 Bob’s Computer Brent’s Computer 68 S0/0 FA1 204.250.10.0 Network 192.60.18.62 Access List Problem #23 Deny/Permit Telnet Write a standard access list to deny Brent and Bob’s computer telnet access to into Router A. Permit all other telnet traffic from the 192.60.18.0 network. Keep in mind that there may be multiple ways many of the individual statements in an ACL can be written. Place the access list at: Router Name: ___________________________ Interface: _______________________________ Access-list #: ____________________________ [Writing and installing an ACL] Router# configure terminal (or config t) Router(config)#______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ Router(config)# ___________________ Router(config-line)# access-class _________ in or out (circle one) Router(config-line)# exit Router(config)# exit Optional ACL Commands & Other Network Security Ideas In order to reduce the chance of spoofing from outside your network consider adding the following statements to your network’s inbound access list. router# config t router(config)# access-list 100 deny ip 10.0.0.0 0.255.255.255 any router(config)# access-list 100 deny ip 172.16.0.0 0.0.255.255 any router(config)# access-list 100 deny ip 192.168.0.0 0.0.255.255 any router(config)# access-list 100 deny ip 127.0.0.0 0.255.255.255 any router(config)# access-list 100 deny ip 224.0.0.0 31.255.255.255 any router(config)# access-list 100 deny ip your-subnet-# your-subnet-mask-# any router(config)# access-list 100 deny igmp any any router(config)# access-list 100 deny icmp any any redirect router(config)# access-list 100 permit any any router(config)# interface e0 (or whatever your inbound port is) router(config-if)# ip access-group in router(config-if)# exit router(config)# exit Another handy security tool is to only allow ip packets out of your network with your source address. router# config t router(config)# access-list 100 permit ip your-subnet-# your-subnet-mask-# any router(config)# interface e0 (or whatever your outbound port is) router(config-if)# ip access-group out router(config-if)# exit router(config)# exit To keep packets with unreachable destinations from entering your network add this command: ip route 0.0.0.0 0.0.0.0 null 0 255 To protect against smurf and other attacks add the following commands to every external interface: no ip directed-broadcast no ip source-route fair-queue scheduler interval 500 69 Port Numbers Port numbers are now assigned by the ICANN (Internet Corporation for Assigned Names and Numbers). Commonly used TCP and UDP applications are assigned a port number; such as: HTTP - 80, POP3 - 110, FTP - 20. When an application communicates with another application on another node on the internet, it specifies that application in each data transmission by using its port number. You can also type the name (ie. Telnet) instead of the port number (ie. 23). Port numbers range from 0 to 65536 and are divided into three ranges: Well Known Ports Registered Ports Dynamic and/or Private Ports 0 to 1,023 1,024 to 49,151 49,152 to 65,535 Below is a short list of some commonly used ports. For a complete list of port numbers go to http://www.iana.org/assignments/port-numbers. Some commonly used port numbers: 0 1 5 7 9 11 13 17 18 19 20 21 22 23 25 29 37 39 42 70 Reserved TCPMUX RJE ECHO DISCARD SYSTAT DAYTIME QUOTE MSP CHARGEN FTP-DATA FTP SSH Telnet SMTP MSG ICP TIME RLP NAMESERV (TCP Port Service Multiplexer) (Remote Job Entry) (Active users) (Quote of the day) (Message Send Protocol) (Character generator) (File Transfer Protocol - Data) (File Transfer Protocol - Control) (Remote Login Protocol) (Terminal Connection) (Simple Mail Transfer Protocol) (Resource Location Protocol (Host Name Server) 43 49 53 67 68 69 70 75 79 80 95 101 108 109 110 113 115 117 118 119 123 137 139 143 150 156 161 179 190 194 197 389 396 443 444 445 458 546 547 563 569 NICNAME LOGIN DNS BOOTP BOOTPS TFTP GOPHER (Who Is) (Login Host Protocol) (Domain Name Server) (Bootstrap Protocol Server) (Bootstrap Protocol Client) (Trivial File Transfer Protocol) (Gopher Services ) (Any Privite Dial-out Service) FINGER HTTP (Hypertext Transfer Protocol) SUPDUP (SUPDUP Protocol) HOSTNAME (NIC Host Name Server) SNAGAS (SNA Gateway Access Server) POP2 (Post Office Protocol - Version 2) POP3 (Post Office Protocol - Version 3) AUTH (Authentication Service) SFTP (Simple File Transfer Protocol) UUCP-PATH (UUCP Path Service) SQLSERV (SQL Services) NNTP (Newsgroup) NTP (Network Tim Protocol) NetBIOS-NS (NetBIOS Name Service) NetBIOS-SSN (NetBIOS Session Service ) IMAP (Interim Mail Access Protocol) SQL-NET (NetBIOS Session Service) SQLSRV (SQL Service) SNMP (Simple Network Management Protocol) BGP (Border Gateway Protocol) GACP (Gateway Access Control Protocol) IRC (Internet Relay Chat) DLS (Directory Location Service) LDAP (Lightweight Directory Access Protocol) NETWARE-IP (Novell Netware over IP ) HTTPS (HTTP MCom) SNPP (Simple Network Paging Protocol) Microsoft-DS Apple QuickTime DHCP Client DHCP Server SNEWS MSN Inside Cover ...
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This note was uploaded on 03/06/2011 for the course BUSN 115 taught by Professor Jack during the Winter '10 term at DeVry Arlington.

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