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Answers to Scenario 5-2: IP Subnet Design with a Class B Network 343
The first six subnets, including the zero subnet, were chosen for this example, as listed in
Table 5-50.
Answers to Task 3 for Scenario 5-2
Given the details in Figure 5-44 and Table 5-46 for Scenario 5-2, the configurations in Example
5-32, Example 5-33, and Example 5-34 satisfy the exercise of creating IP-related configuration
commands for each router. These examples include only the IP-related commands.
Table 5-50
Scenario 5-2 Subnets and Addresses
Location of Subnet
Geographically
Subnet Mask
Subnet Number
Router's IP Address
Ethernet off Router A
255.255.254.0
172.16.2.0
172.16.2.1
Ethernet off Router B
255.255.254.0
172.16.4.0
172.16.4.2
Ethernet off Router C
255.255.254.0
172.16.6.0
172.16.6.3
Serial between A and B
255.255.254.0
172.16.0.0
172.16.0.1 (A) and .2
(B)
Serial between A and C
255.255.254.0
172.16.8.0
172.16.8.1 (A) and .3
Serial between B and C
255.255.254.0
172.16.10.0
172.16.10.2 (B) and .3
Example 5-32
Router A Configuration, Scenario 5-2
ip subnet-zero
no ip domain-lookup
!
interface serial0
ip address 172.16.0.1 255.255.254.0
interface serial 1
ip address 172.16.8.1 255.255.254.0
interface ethernet 0
ip address 172.16.2.1 255.255.254.0
!
router igrp 6
network 172.16.0.0
Example 5-33
Router B Configuration, Scenario 5-2
ip subnet-zero
no ip domain-lookup
!
interface serial0
ip address 172.16.0.2 255.255.254.0
interface serial 1
ip address 172.16.10.2 255.255.254.0
interface ethernet 0
ip address 172.16.4.2 255.255.254.0
continues
ch05.fm Page 343 Monday, March 20, 2000 5:06 PM