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Troubleshooting Exercises

1

Example 6-32 through Example 6-34 show the configurations for the three routers in Figure 6-23. Which subnets are in the routing tables of each router? From each router, which subnets are reachable and which subnets (if any) are unreachable?

Figure 6-23. The network for Troubleshooting Exercises 1 and 2.


Example 6-32. The configuration of RTA in Figure 6-23.
RTA#show running-config
Building configuration...
Current configuration:
!
version 11.2
no service udp-small-servers
no service tcp-small-servers
!
hostname RTA
!
!
!
interface Ethernet0
  ip address 192.168.13.86 255.255.255.248
!
interface Serial0
  no ip address
  shutdown
!
interface Serial1
  no ip address
  shutdown
!
interface TokenRing0
  ip address 192.168.13.34 255.255.255.224
  ring-speed 16
!
router rip
  version 2
  network 192.168.13.0
!
no ip classless
!
!
line con 0
line aux 0
line vty 0 4
  login
!
end
RTA#

Example 6-33. The configuration of RTB in Figure 6-23.
RTB#show running-config
Building configuration...
Current configuration:
!
version 11.2
no service udp-small-servers
no service tcp-small-servers
!
hostname RTB
!
!
!
interface Ethernet0
  ip address 192.168.13.90 255.255.255.240
!
interface Serial0
  no ip address
  shutdown
!
interface Serial1
  no ip address
  shutdown
!
interface TokenRing0
  ip address 192.168.13.35 255.255.255.224
  ring-speed 16
!
router rip
  version 2
  network 192.168.13.0
!
no ip classless
!
!
line con 0
line aux 0
line vty 0 4
  login
!
end
RTB#

Example 6-34. The configuration of RTC in Figure 6-23.
RTC#show running-config
Building configuration...
Current configuration:
!
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname RTC
!
!
!
interface Ethernet0
  ip address 192.168.13.75 255.255.255.224
!
interface Serial0
  no ip address
  shutdown
!
interface Serial1
  no ip address
  shutdown
!
interface TokenRing0
  ip address 192.168.13.33 255.255.255.224
  ring-speed 16
!
router rip
  network 192.168.13.0
!
no ip classless
!
line con 0
line 1 8
line aux 0
line vty 0 4
  login
!
end
RTC#

2

The configurations of RTA and RTB in Figure 6-23 are changed as follows:[14]

[14] The configuration shown is for RTB. RTA is identical, except for the IP address, which is 192.168.13.34.

   interface Ethernet0
   ip address 192.168.13.35 255.255.255.224
   ip rip receive version 1 2

Will any subnets be added to any routing tables as a result of this change? Explain why or why not.


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