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: A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?

Correct answer: IGRP has a lower administrative distance.When two protocols offer a route to the same network, the router compares administrative distance first and never reaches the metrics - which are not comparable between protocols in any case, hop count meaning nothing beside a composite of bandwidth and delay. IGRP’s distance is 100 against RIP’s 120, so the IGRP route is installed and the RIP one is held in reserve.

Q: IGRP uses which of the following as default parameters for finding the best path to a remote network? 1.Hop count 2.MTU 3.Cumulative interface delay 4.STP 5.Path bandwidth value

Correct answer: 3 and 5By default IGRP uses bandwidth and delay, combining them into a composite metric. Reliability, load and MTU can be included by setting the K values, but they are switched off by default, and MTU is carried in the update without being used in the calculation. Hop count is RIP’s metric, and STP is a switching protocol with no part in routing.

21.

The Corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3. Looking at the output from the Corporate router, what will the router do with this packet?

Corp#sh ip route
[output cut]
R    192.168.215.0 [120/2] via 192.168.20.2, 00:00:23, Serial0/0
R    192.168.115.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0
R    192.168.30.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0
C    192.168.20.0 is directly connected, Serial0/0
C    192.168.214.0 is directly connected, FastEthernet0/0

A.The packet will be discarded.
B.The packet will be routed out the S0/0 interface.
C.The router will broadcast looking for the destination.
D.The packet will be routed out the Fa0/0 interface.

Answer: A

Since the routing table shows no route to the 192.168.22.0 network, the router will discard the packet and send an ICMP destination unreachable message out interface FastEthernet 0/0, which is the source LAN where the packet originated from.

Discuss in Forum

22.

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.

Discuss in Forum

23.

What is route poisoning?

A.It sends back the protocol received from a router as a poison pill, which stops the regular updates.
B.It is information received from a router that can't be sent back to the originating router.
C.It prevents regular update messages from reinstating a route that has just come up.
D.It describes when a router sets the metric for a downed link to infinity.

Answer: D

Another way to avoid problems caused by inconsistent updates and to stop network loops is route poisoning. When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable (sometimes referred to as infinite).

Discuss in Forum

24.

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.

Discuss in Forum

25.

A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?

A.IGRP has a faster update timer.
B.IGRP has a lower administrative distance.
C.RIP has a higher metric value for that route.
D.The IGRP route has fewer hops.

Answer: B

Correct answer: IGRP has a lower administrative distance.

When two protocols offer a route to the same network, the router compares administrative distance first and never reaches the metrics - which are not comparable between protocols in any case, hop count meaning nothing beside a composite of bandwidth and delay. IGRP’s distance is 100 against RIP’s 120, so the IGRP route is installed and the RIP one is held in reserve.

Discuss in Forum

26.

What does RIPv2 use to prevent routing loops?

1.CIDR

2.Split horizon

3.Authentication

4.Classless masking

5.Holddown timers

A.1 and 3
B.2, 3 and 5
C.2 and 5
D.3 and 4

Answer: C

RIPv2 uses the same timers and loop-avoidance schemes as RIPv1. Split horizon is used to stop an update from being sent out the same interface it was received on. Holddown timers allow time for a network to become stable in the case of a flapping link.

Discuss in Forum

27.

Which two of the following are true regarding the distance-vector and link-state routing protocols?

1.Link state sends its complete routing table out all active interfaces on periodic time intervals.

2.Distance vector sends its complete routing table out all active interfaces on periodic time intervals.

3.Link state sends updates containing the state of its own links to all routers in the internetwork.

4.Distance vector sends updates containing the state of its own links to all routers in the internetwork.

A.1 only
B.3 only
C.2 and 3 only
D.None of the above

Answer: C

The distance-vector routing protocol sends its complete routing table out all active interfaces at periodic time intervals. Link-state routing protocols send updates containing the state of its own links to all routers in the internetwork.

Discuss in Forum

28.

IGRP uses which of the following as default parameters for finding the best path to a remote network?

1.Hop count

2.MTU

3.Cumulative interface delay

4.STP

5.Path bandwidth value

A.1 and 3
B.3 and 5
C.2, 3 and 5
D.All of the above

Answer: B

Correct answer: 3 and 5

By default IGRP uses bandwidth and delay, combining them into a composite metric. Reliability, load and MTU can be included by setting the K values, but they are switched off by default, and MTU is carried in the update without being used in the calculation. Hop count is RIP’s metric, and STP is a switching protocol with no part in routing.

Discuss in Forum

29.

Network 206.143.5.0 was assigned to the Acme Company to connect to its ISP. The administrator of Acme would like to configure one router with the commands to access the Internet. Which commands could be configured on the Gateway router to allow Internet access to the entire network?

1.Gateway(config)# ip route 0.0.0.0 0.0.0.0 206.143.5.2

2.Gateway(config)# router rip

3.Gateway(config-router)# network 206.143.5.0

4.Gateway(config-router)# network 206.143.5.0 default

A.1 only
B.3 only
C.1, 2 and 4
D.1 and 4

Answer: D

There are actually three different ways to configure the same default route, but only two are shown in the answer. First, you can set a default route with the 0.0.0.0 0.0.0.0 mask and then specify the next hop, as in option A. Or you can use 0.0.0.0 0.0.0.0 and use the exit interface instead of the next hop. Finally, you can use option D with the ip default-network command.

Discuss in Forum

Loading…

Topics

Other Subjects

Tags: IP Routing Questions and Answers || IP Routing MCQ Questions and Answers || IP Routing GK Questions and Answers || IP Routing GK MCQ Questions || IP Routing Multiple Choice Questions and Answers || IP Routing GK || GK on IP Routing || Computer Networking Questions and Answers || Computer Networking MCQ Questions and Answers || Computer Networking GK Questions and Answers || GK on Computer Networking

IP Routing Questions and Answers

Topics

Other Subjects

About Us

Stay informed about all important Dates & Notifications