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IT263 Homework #2 This is a big one, so get started early! 1) Read chapters 1 - 16 in your textbook. It sounds like a lot, but the chapters are...



Refer to the figure above for questions #3 through #5
3. (4 points) What is the address class (A, B or C) for these IP addresses?
4. (4 points) Assume that the subnet mask for the network above is 255.255.192.0, so the left subnet is 100.16.0.0/18 and the right subnet is 100.16.64.0/18. What is the maximum number of IP hosts allowed per subnet using this mask?
5. Now, assume that Client #1 has just powered up and initialized. Now its user types http://100.16.64.12 into a browser.
a) (4 points) The first packet sent by Client #1 will be “ARP Request for 100.16.0.1” (which will be broadcast). What is the purpose of this packet? Which device responds to it?
b) Now Client #1 transmits a request packet to the Web Server. Tell me the specific numeric values (from the diagram) that will be in each of the following fields of this request packet:
i) (4 points) Destination MAC Address in Ethernet header
ii) (4 points) Destination IP Address in IP header
6. (10 points) An organization has been assigned the Class B address 145.138 and wants to set up as many subnets as they can, in which each subnet can handle at least 100 hosts. What subnet mask should they use?














7. (25 points) Consider a PC with IP 208.128.48.123 and subnet mask 255.255.255.192.
What IP network is this address on (assume classfull addressing)?
What is the subnet ID for its subnet?
List all IP addresses on the same subnet as this one.
What is maximum number of hosts in this subnet?
How many different subnets exist in this IP network using this subnet mask?

IT263 Homework #2 This is a big one, so get started early! 1) Read chapters 1 – 16 in your textbook. It sounds like a lot, but the chapters are short, and it is a fairly light read. Depending on how fast you read, this should take two or three hours. (If you don’t fall asleep!) 2) (20 points) Use WireShark to do packet capture. You can download it from www.wireshark.org or use one of the computers in room 658. In particular, go to the CDM website when packet capture is on, and show me a screen shot of you having highlighted one of the HTTP GET packets. Hints: a. There will be a clickable interface in the opening screen under “Capture”. Click on that to get things started. b. You will probably want to type “tcp” in the filter text box; otherwise, you will capture a bajillion packets. (It’s a technical term.) You will also need to click “apply” after you type in tcp. c. Open your browser and navigate to the CDM page and watch the packets flow! Man, that is a big page. 3) Answer the following questions: Refer to the figure above for questions #1 and #2 1. Assume that Client #1, #2 and #3 have all transmitted requests to the Web Server (and received replies from the Web Server) within the past 2 minutes. a) (4 points) Draw a table that shows all the contents of the Forwarding Table for Switch #1. Fill this table out, writing in the actual addresses from the diagram above. Your table should have the columns shown below (do not include an Update Time column). Address Port (P1, P2, or P3) b) (4 points) Similarly, draw a table to show me all the contents of the Forwarding Table for Switch #2 with actual addresses from the diagram above. 2. Now, assume that Client #1 transmits a request packet to the Web Server. a) (4 points) Which of the 4 devices (Client #1, Client #2, Client #3, Web Server) will see a copy of this request packet? b) Tell me the specific numeric values (from the diagram) that will be in each of the following fields of this request packet: b.i) (4 points) Destination MAC Address in Ethernet header b.ii) (4 points) Destination IP Address in IP header Refer to the figure above for questions #3 through #5 3. (4 points) What is the address class (A, B or C) for these IP addresses? 4. (4 points) Assume that the subnet mask for the network above is 255.255.192.0, so the left subnet is 100.16.0.0/18 and the right subnet is 100.16.64.0/18. What is the maximum number of IP hosts allowed per subnet using this mask? 5. Now, assume that Client #1 has just powered up and initialized. Now its user types http://100.16.64.12 into a browser.
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a) (4 points) The first packet sent by Client #1 will be “ARP Request for 100.16.0.1” (which will be broadcast). What is the purpose of this packet? Which device responds to it? The purpose of the packet is to ask permission or a request to talk to the web server. The use of datagram transmission is utilized in the similar manner where the IP router is utilized. The internet sends an IP across a single network in a network packet. b) Now Client #1 transmits a request packet to the Web Server. Tell me the specific numeric values (from the diagram) that will be in each of the following fields of this request packet: b.i) (4 points) Destination MAC Address in Ethernet header b.ii) (4 points) Destination IP Address in IP header 6. (10 points) An organization has been assigned the Class B address 145.138 and wants to set up as many subnets as they can, in which each subnet can handle at least 100 hosts. What subnet mask should they use? 7. (25 points) Consider a PC with IP 208.128.48.123 and subnet mask 255.255.255.192. What IP network is this address on (assume classfull addressing)? What is the subnet ID for its subnet? List all IP addresses on the same subnet as this one. What is maximum number of hosts in this subnet? How many different subnets exist in this IP network using this subnet mask? 8. (5 points) Consider a PC with IP 44.110.6.118 and subnet mask 255.255.0.0. This PC wishes to transmit a data packet to destination IP 44.112.17.108 . Does this packet need to go through a router or not? Why or why not? 9. (10) Describe the steps that occur within the Domain Name System when you use a browser in a DePaul lab to access www.nsa.gov . Assume empty DNS caches.
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