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from Slides TCP/IP - Forouzan Chapter 5 Subnetting and Supernetting Subnetting Masking Examples of Subnetting Variable-Length Subnetting Supernetting Forouzan Notes COSC 6377 - Fall 2000 5-1 Figure 5-1 A network with two levels of hierarchy (not subnetted) 141.14.2.105 141.14.2.21 141.14.2.20 141.14.7.96 141.14.7.95 To the rest of the Internet R1 Network 141.14.0.0 141.14.7.44 141.14.22.9...
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from Slides TCP/IP - Forouzan
Chapter 5
Subnetting and Supernetting
Subnetting Masking Examples of Subnetting Variable-Length Subnetting Supernetting
Forouzan Notes
COSC 6377 - Fall 2000
5-1
Figure 5-1
A network with two levels of hierarchy (not subnetted)
141.14.2.105 141.14.2.21 141.14.2.20 141.14.7.96 141.14.7.95
To the rest of the Internet
R1
Network
141.14.0.0
141.14.7.44 141.14.22.9 141.14.22.8
141.14.22.64
Forouzan Notes
COSC 6377 - Fall 2000
5-2
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-2
A network with three levels of hierarchy (subnetted)
141.14.2.21 141.14.2.20
141.14.2.105
141.14.7.96
141.14.2.0
To the rest of the Internet
Subnetwork
141.14.7.45 141.14.7.44
R1
Subnetwork
141.14.7.0
Subnetwork
141.14.22.0
141.14.22.8 141.14.22.9 141.14.22.64
Site 141.14.0.0
Forouzan Notes
COSC 6377 - Fall 2000
5-3
Figure 5-3
Addresses in a network with and without subnetting
141 . 14 . 2 . 21
Netid
Network access
Hostid
Host access
a. Without subnetting
141 . 14 . 2 . 21
Netid
Subnetwork access
Subnetid
Hostid
Host access
b. With subnetting
Forouzan Notes COSC 6377 - Fall 2000 5-4
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-4
Hierarchy concept in a telephone number
( 408 ) 864 - 8902
Area code Exchange Connection
Forouzan Notes
COSC 6377 - Fall 2000
5-5
Figure 5-5
Masking
141.14.2.21 IP address
Mask
255.255.0.0
141.14.0.0 Network address
a. Without subnetting
141.14.2.21 IP address
Mask
255.255.255.0
141.14.2.0 Subnetwork address
b. With subnetting
Forouzan Notes COSC 6377 - Fall 2000 5-6
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-6
Applying bit-wise and operator to achieve masking
IP address Mask
141.14.2.21 10001101 00001110 11111111 00001110
00000010 00010101 00000000 00000000 00000000 00000000
11111111 141.14.0.0 Network 10001101 address
a. Without subnetting IP address Mask
141.14.2.21 10001101 00001110 11111111 00001110
00000010 00010101 11111111 00000000
11111111 141.14.2.0 Subnetwork 10001101 address
Forouzan Notes
00000010 00000000
b. With subnetting
COSC 6377 - Fall 2000 5-7
Figure 5-7
Special addresses in subnetting
Subnetid
Any
Hostid
All 0s
Subnetwork address Any All 1s
Broadcast to all hosts in a specific subnet All 0s Subnetid all 0s All 1s Subnetid all 1s
Forouzan Notes COSC 6377 - Fall 2000 5-8
Any
Any
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-8
Masks in example 1
Mask Netid
255.0.0.0
Hostid
11111111 00000000
00000000
00000000
a. Without subnetting
Mask Netid
255.255.192.0
Subnetid Hostid
11111111 11111111
11000000
00000000
b. With subnetting
Forouzan Notes
COSC 6377 - Fall 2000
5-9
Figure 5-9
Range of addresses in example 1
Special addresses (hostid all 0s) Special addresses (subnetid all 0s)
Special addresses (hostid all 1s)
X.0.0.0
1st subnet 2nd subnet
X.0.0.1 X.0.64.1 X.0.128.1
X.0.64.0 X.0.128.0
1022nd subnet
X.255.128.0 X.255.192.0
. . .
X.255.128.1 X.255.192.1
... ... ... ... ...
X.0.63.254 X.0.127.254 X.0.191.254
X.0.63.255 X.0.127.255 X.0.191.255
X.255.191.254 X.255.191.255 X.255.255.254 X.255.255.255
. . .
Special addresses (subnetid all 1s)
Forouzan Notes
COSC 6377 - Fall 2000
5-10
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-10
Subnetworks in example 1
X.0.64.1
X.0.64.2
X.0.127.254
... ...
X.0.191.254 X.0.128.0 Subnetwork
X.0.64.0 Subnetwork X.0.128.2 X.0.128.1
To the rest of the Internet
R1
...
X.255.128.2 X.255.128.1
Site
...
X.255.191.254
X.255.128.0 Subnetwork
X.0.0.0
Forouzan Notes
COSC 6377 - Fall 2000
5-11
Figure 5-11
Mask in example 2
Mask Netid
255.255.0.0
Hostid
11111111
11111111
00000000
00000000
a. Without subnetting
Mask Netid
255.255.240.0
Subnetid Hostid
11111111
11111111
1111 0000
00000000
b. With subnetting
Forouzan Notes
COSC 6377 - Fall 2000
5-12
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-12
Range of addresses in example 2
Special addresses (hostid all 0s) addresses Special (subnetid all 0s)
Special addresses (hostid all 1s)
X.Y.0.0
1st subnet 2nd subnet
X.Y.0.1 X.Y.16.1 X.Y.32.1
X.Y.16.0 X.Y.32.0
. . .
14th subnet X.Y.224.0
X.Y.224.1 X.Y.240.1
X.Y.240.0
... ... ... ... ...
X.Y.15.254 X.Y.31.254 X.Y.47.254
X.Y.15.255 X.Y.31.255 X.Y.47.255
. . .
X.Y.239.254 X.Y.255.254
X.Y.239.255 X.Y.255.255
Special addresses (subnetid all 1s)
Forouzan Notes COSC 6377 - Fall 2000 5-13
Figure 5-13
Subnetworks in example 2
X.Y.16.2 X.Y.16.1
...
X.Y.31.254
X.Y.16.0 Subnetwork X.Y.32.2 X.Y.32.1
To the rest of the Internet
R1
...
X.Y.47.254
X.Y.32.0 Subnetwork
...
X.Y.224.2 X.Y.224.1
Site
...
X.Y.239.254
X.Y.224.0 Subnetwork
X.Y.0.0
McGraw-Hill Forouzan Notes
COSC 6377 - Fall 2000 The
McGraw-Hill Companies, Inc., 2000 5-14
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-14
Masks in example 3
Mask
255.255.255.0
Netid Hostid
11111111
11111111
11111111
00000000
a. Without subnetting
Mask
255.255.255.224
Netid Subnetid Hostid
11111111
11111111
11111111 111 00000
b. With subnetting
Forouzan Notes COSC 6377 - Fall 2000 5-15
Figure 5-15
Range of addresses in example 3
Special addresses hostid all 0s Special addresses subnetid all 0s
Special addresses hostid all 1s
X.Y.Z.0
1st subnet 2nd subnet
X.Y.Z.1 X.Y.Z.33 X.Y.Z.65
X.Y.Z.32 X.Y.Z.64
. . .
6th subnet
X.Y.Z.192 X.Y.Z.224
X.Y.Z.193 X.Y.Z.225
... ... ... ... ...
X.Y.Z.30 X.Y.Z.62 X.Y.Z.94
X.Y.Z.31 X.Y.Z.63 X.Y.Z.95
. . .
X.Y.Z.222 X.Y.Z.254
X.Y.Z.223 X.Y.Z.255
Special addresses subnetid all 1s
Forouzan Notes
COSC 6377 - Fall 2000
5-16
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-16
Subnetworks in example 3
X.Y .Z.34 X.Y .Z.33
...
X.Y.Z.62
X.Y.Z.32 Subnetwork X.Y.Z.66 X.Y .Z.65
To the rest of the Internet
...
X.Y.Z.94
R1
X.Y .Z.64 Subnetwork
...
X.Y.Z.194 X.Y .Z.193
Site
...
X.Y.Z.222
X.Y.Z.0
X.Y.Z.192 Subnetwork
Forouzan Notes
COSC 6377 - Fall 2000
5-17
Figure 5-17
Variable-length subnetting
Site
62 hosts
X.Y.Z.0
62 hosts First mask 255.255.255.192 62 hosts
30 hosts
Router
Forouzan Notes
Second mask 255.255.255.224 30 hosts
COSC 6377 - Fall 2000
5-18
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-18
Supernetwork
First class C address
Second class C address
X.Y.32.254 X.Y.32.2 X.Y.32.1
X.Y.33.1 X.Y.33.253 X.Y.33.254
To the rest of the Internet
R1
Supernetwork
X.Y.32.0
X.Y.34.1 X.Y.34.2 X.Y.35.1 X.Y.34.254
X.Y.35.254 X.Y.35.253
Fourth class C address
Third class C address
Forouzan Notes
COSC 6377 - Fall 2000
5-19
Figure 5-19
Supernet mask Netid 11111111 11111111 11111111 Hostid 00000000
Netid 11111111 11111111
Subnetid Hostid 11000000 11111111 4 subnets out of 1 network Hostid
a. Subnetting
Netid 11111111 11111111 11111111
00000000
Supernetid 11111111 11111111 111111 00
Hostid 00000000
b. Supernetting
1 supernet out of 4 networks
5-20
Forouzan Notes
COSC 6377 - Fall 2000
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-20
Two ways of defining a supernet
X.Y.32.0
, 255.255.252.0 Same
X.Y.32.0
,
1024
Forouzan Notes
COSC 6377 - Fall 2000
5-21
Figure 5-21
Example of supernetting
X.Y.33.4
X.Y.39.12
xxxxxxxx 11111111 xxxxxxxx
X.Y.32.0
yyyyyyyy 00100001 11111111 11111100
00000100 00000000 00000000
xxxxxxxx 11111111 xxxxxxxx
X.Y.36.0
yyyyyyyy 00100111 11111111 11111100
00001100 00000000 00000000
yyyyyyyy 00100000
yyyyyyyy 00100100
Forouzan Notes
COSC 6377 - Fall 2000
5-22
Forouzan Notes
COSC 6377 - Fall 2000
5-
Slides from TCP/IP - Forouzan
Figure 5-22
CIDR
Default mask
255.255.255.0 255.255.255.0 255.255.255.0 255.255.255.0
. . .
Network Next hop address address X.Y.32.0 ........... X.Y.33.0 ........... X.Y.34.0 ........... X.Y.35.0 ...........
. . .
. . .
a. Routing table without supernet mask Network Next hop address address 255.255.252.0 X.Y.32.0 ........... Default mask
. . .
. . .
. . .
b. Routing table with supernet mask
Forouzan Notes
COSC 6377 - Fall 2000
5-23
Forouzan Notes
COSC 6377 - Fall 2000
5-
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U. Houston - ASSIGNMENT - 4
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U. Houston - HW - 1
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U. Houston - ASSIGN - 2
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U. Houston - HW - 3
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U. Houston - HW - 3
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U. Houston - HW - 4
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U. Houston - HW - 2
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U. Houston - ASSIGNMENT - 2
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Sheila Schatzke Assignment 3.21Computer WorkstationsOptiPlex 170L Small Desktop: Operating System: File System: Memory: Keyboard: Monitors: Graphics Cards: Boot Hard Drive: Floppy: Mouse: Integrated Network Adapter (NIC): Removable Media Storage
U. Houston - SCHATZKES - 3242
Autobiography: Sheila SchatzkeThis autobiography starts at age 22. In 1993 I moved from Largo, Fl. to Houston, TX. I went to Houston to take care of my Grandfather who was recovering from an operation. I liked it so much I stayed. I enrolled at Hou