Exercise: Ip Routing

Questions for: Ip Routing

Two connected routers are configured with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?
A:
The updated information will be added to the existing routing table.
B:
The update will be ignored and no further action will occur.
C:
The updated information will replace the existing routing table entry.
D:
The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence.
Answer: B
When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD, then the router will choose the one route with the lowest metrics, or in RIP's case, hop count.
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What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?
A:
Router(config-if)# no routing
B:
Router(config-if)# passive-interface
C:
Router(config-router)# passive-interface s0
D:
Router(config-router)# no routing updates
Answer: C
The (config-router)#passive-interface command stops updates from being sent out an interface, but route updates are still received.
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What is split horizon?
A:
Information about a route should not be sent back in the direction from which the original update came.
B:
It splits the traffic when you have a large bus (horizon) physical network.
C:
It holds the regular updates from broadcasting to a downed link.
D:
It prevents regular update messages from reinstating a route that has gone down.
Answer: A
A split horizon will not advertise a route back to the same router it learned the route from.
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You have the following routing table. Which of the following networks will not be placed in the neighbor routing table? 
R    192.168.30.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0
C    192.168.40.0/24 is directly connected, Serial0
     172.16.0.0/24 is subnetted, 1 subnets
C    172.16.30.0 is directly connected, Loopback0
R    192.168.20.0/24 [120/1] via 192.168.40.1, 00:00:12, Serial0
R    10.0.0.0/8 [120/15] via 192.168.40.1, 00:00:07, Serial0
C    192.168.50.0/24 is directly connected, Ethernet0
A:
172.16.30.0
B:
192.168.30.0
C:
10.0.0.0
D:
All of them will be placed in the neighbor routing table.
Answer: C
The network 10.0.0.0 cannot be placed in the next router's routing table because it already is at 15 hops. One more hop would make the route 16 hops, and that is not valid in RIP networking.
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Which statement is true regarding classless routing protocols?
  1. The use of discontiguous networks is not allowed.
  2. The use of variable length subnet masks is permitted.
  3. RIPv1 is a classless routing protocol.
  4. IGRP supports classless routing within the same autonomous system.
  5. RIPv2 supports classless routing.
A:
1, 3 and 5
B:
3 and 4
C:
2 and 5
D:
None of the above
Answer: C
Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontiguous networking.
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