IP Routing Questions and Answers

Q: Which of the following is true regarding RIPv2?

Correct answer: It has the same timers as RIPv1.RIPv2 keeps the same 30 second update, 180 second invalid and 240 second flush timers, so it converges no faster than RIPv1. What it adds is the subnet mask in its updates - making it classless - along with multicast rather than broadcast updates and optional authentication. Its administrative distance is 120, the same as RIPv1, and it is configured almost identically.

Q: What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?

Correct answer: Router(config-router)# passive-interface s0Two things must be right: the command belongs under the routing process rather than on the interface, and the interface is named as its argument. The effect is one-way - the interface stops sending updates while continuing to receive and process them - which suits a link to a stub network or to a device that should not hear the routing protocol.

Q: You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?

Correct answer: The route is inaccessible.RIP counts to infinity at 16, so a metric of 16 is not a distance but a poison: it is how a router announces that a route it once advertised is gone. Since the maximum usable metric is 15 hops, any RIP network wider than that cannot be reached at all - which is one of the protocol’s principal limitations.

21.

Which of the following is true regarding RIPv2?

A.It has a lower administrative distance than RIPv1.
B.It converges faster than RIPv1.
C.It has the same timers as RIPv1.
D.It is harder to configure than RIPv1.

Answer: C

Correct answer: It has the same timers as RIPv1.

RIPv2 keeps the same 30 second update, 180 second invalid and 240 second flush timers, so it converges no faster than RIPv1. What it adds is the subnet mask in its updates - making it classless - along with multicast rather than broadcast updates and optional authentication. Its administrative distance is 120, the same as RIPv1, and it is configured almost identically.

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22.

Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2?

1.The command is used to establish a static route.

2.The default administrative distance is used.

3.The command is used to configure the default route.

4.The subnet mask for the source address is 255.255.255.0.

A.1 and 2
B.2 and 4
C.3 and 4
D.All of the above

Answer: A

Although answer D almost seems right, it is not; the mask is the mask used on the remote network, not the source network. Since there is no number at the end of the static route, it is using the default administrative distance of 1.

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23.

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

Correct answer: Router(config-router)# passive-interface s0

Two things must be right: the command belongs under the routing process rather than on the interface, and the interface is named as its argument. The effect is one-way - the interface stops sending updates while continuing to receive and process them - which suits a link to a stub network or to a device that should not hear the routing protocol.

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24.

If your routing table has a static, a RIP, and an IGRP route to the same network, which route will be used to route packets by default?

A.Any available route
B.RIP route
C.Static route
D.IGRP route
E.They will all load-balance.

Answer: C

Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other found route. IGRP has an administrative distance of 100, and RIP has an administrative distance of 120, by default.

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25.

You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?

A.The route is 16 hops away.
B.The route has a delay of 16 microseconds.
C.The route is inaccessible.
D.The route is queued at 16 messages a second.

Answer: C

Correct answer: The route is inaccessible.

RIP counts to infinity at 16, so a metric of 16 is not a distance but a poison: it is how a router announces that a route it once advertised is gone. Since the maximum usable metric is 15 hops, any RIP network wider than that cannot be reached at all - which is one of the protocol’s principal limitations.

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