Routing TCP/IP, Volume 1 (2nd Edition)

1

A router has the configuration in Example 13-34.

Example 13-34. A router configuration attempting to filter the default route.

router eigrp 1 network 10.0.0.0 distribute-list 1 in Ethernet5/1 ! access-list 1 deny 0.0.0.0 255.255.255.255 access-list 1 permit any

The intention is to deny the incoming default route at interface E5/1 and to permit all other routes incoming on that interface. However, no routes are being accepted on E5/1. What is wrong?

2

Grimwig in Figure 13-6 has the configuration in Example 13-35.

Example 13-35. Grimwig's configuration for troubleshooting Exercise 2.

router ospf 1 redistribute rip metric 100 network 192.168.5.1 0.0.0.0 area 0 distance 255 distance 110 0.0.0.0 255.255.255.255 1 ! router rip redistribute ospf 1 metric 2 network 192.168.6.0 distance 255 distance 120 192.168.6.1 0.0.0.0 2 ! ip classless access-list 1 permit 192.168.3.0 access-list 1 permit 192.168.4.0 access-list 2 permit 192.168.1.0 access-list 2 permit 192.168.2.0

What effect will this configuration have on the routes at Grimwig?

3

The routers in Figure 13-9 are running OSPF. Router B has the configuration in Example 13-36.

Figure 13-9. The network for Troubleshooting Exercises 3 and 4.

Example 13-36. Router B's OSPF configuration from Figure 13-9.

router ospf 50 network 0.0.0.0 255.255.255.255 area 1 distribute-list 1 in ! access-list 1 deny 172.17.0.0 access-list 1 permit any

The intention is to prevent Routers B and C from having a route entry for network 172.17.0.0. This plan seems to be working at Router B, but Router C still has an entry for 172.17.0.0. Why?

4

The routers in Figure 13-9 are running RIP. Router B has the configuration in Example 13-37.

Example 13-37. Router B's RIP configuration.

router rip network 172.19.0.0 network 172.20.0.0 distribute-list 1 out Ethernet0 distribute-list 2 out Ethernet1 ! access-list 1 permit 172.18.0.0 access-list 2 permit 172.22.0.0

The intention is to advertise only network 172.22.0.0 to Router A and to advertise only network 172.18.0.0 to Router C. However, A and C have no RIP entries in their route table. What is wrong?

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