EIGRP and OSPF Questions and Answers

Q: You get a call from a network administrator who tells you that he typed the following into his router: Router(config)#router ospf 1 Router(config-router)#network 10.0.0.0 255.0.0.0 area 0 He tells you he still can't see any routes in the routing table. What configuration error did the administrator make?

Correct answer: The wildcard mask is incorrect.The OSPF network statement takes a *wildcard* mask, not a subnet mask, so 10.0.0.0 with a /8 must be written network 10.0.0.0 0.255.255.255 area 0. As typed, the mask matches nothing and no interface is enabled for OSPF, which is exactly why no routes appear. The process ID is locally significant and any value serves, and area 0 is correct for a single-area design.

Q: Which EIGRP information is held in RAM and maintained through the use of Hello and update packets? 1.Neighbor table 2.STP table 3.Topology table 4.DUAL table

Correct answer: 1 and 3EIGRP maintains three tables in RAM: the neighbor table, built and kept alive by hello packets; the topology table, populated by update packets and holding every route learned with its feasible successors; and the routing table, into which the best routes are installed. There is no DUAL table - DUAL is the algorithm that operates on the topology table - and STP is a switching protocol with no part in EIGRP at all.

Q: You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?

Correct answer: show ip eigrp neighborsThe neighbors output lists each adjacency with the neighbour’s address, the interface, the hold time, the smoothed round trip time, the retransmit timeout and the queue count - which is precisely the set of quantities the question asks for. The topology command shows the routes learned rather than the peers, the interfaces command shows the peer count per interface, and there is no show ip eigrp adjacency.

Which type of OSPF network will elect a backup designated router?

1.Broadcast multi-access

2.Non-broadcast multi-access

3.Point-to-point

4.Broadcast multipoint

A.1 and 2
B.3 and 4
C.3 only
D.None of the above

Answer: A

DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default. No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology.

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Which command will display all the EIGRP feasible successor routes known to a router?

A.show ip routes *
B.show ip eigrp summary
C.show ip eigrp topology
D.show ip eigrp adjacencies

Answer: C

Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure. You can see the topology table with the show ip eigrp topology command.

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What is the administrative distance of OSPF?

A.90
B.100
C.110
D.120

Answer: C

The administrative distance (AD) is a very important parameter in a routing protocol. The lower the AD, the more trusted the route. If you have IGRP and OSPF running, by default IGRP routes would be placed in the routing table because IGRP has a lower AD of 100. OSPF has an AD of 110. RIPv1 and RIPv2 both have an AD of 120, and EIGRP is the lowest, at 90.

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Which of the following protocols support VLSM, summarization, and discontiguous networking?

1.RIPv1

2.IGRP

3.EIGRP

4.OSPF

5.BGP

6.RIPv2

A.1 and 4
B.2 and 5
C.3, 4 and 6
D.All of the above

Answer: C

RIPv1 and IGRP are true distance-vector routing protocols and can't do much, really-except build and maintain routing tables and use a lot of bandwidth! RIPv2, EIGRP, and OSPF build and maintain routing tables, but they also provide classless routing, which allows for VLSM, summarization, and discontiguous networking.

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You get a call from a network administrator who tells you that he typed the following into his router:

Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 255.0.0.0 area 0

He tells you he still can't see any routes in the routing table. What configuration error did the administrator make?

A.The wildcard mask is incorrect.
B.The OSPF area is wrong.
C.The OSPF Process ID is incorrect.
D.The AS configuration is wrong.

Answer: A

Correct answer: The wildcard mask is incorrect.

The OSPF network statement takes a *wildcard* mask, not a subnet mask, so 10.0.0.0 with a /8 must be written network 10.0.0.0 0.255.255.255 area 0. As typed, the mask matches nothing and no interface is enabled for OSPF, which is exactly why no routes appear. The process ID is locally significant and any value serves, and area 0 is correct for a single-area design.

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Which EIGRP information is held in RAM and maintained through the use of Hello and update packets?

1.Neighbor table

2.STP table

3.Topology table

4.DUAL table

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

Answer: C

Correct answer: 1 and 3

EIGRP maintains three tables in RAM: the neighbor table, built and kept alive by hello packets; the topology table, populated by update packets and holding every route learned with its feasible successors; and the routing table, into which the best routes are installed. There is no DUAL table - DUAL is the algorithm that operates on the topology table - and STP is a switching protocol with no part in EIGRP at all.

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Which of the following network types have a designated router and a backup designated router assigned?

1.Broadcast

2.Point-to-point

3.NBMA

4.NBMA point-to-point

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

Answer: B

No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology. DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-Broadcast Multi-Access (NBMA) network by default.

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Your company is running IGRP using an AS of 10. You want to configure EIGRP on the network but want to migrate slowly to EIGRP and don't want to configure redistribution. What command would allow you to migrate over time to EIGRP without configuring redistribution?

A.router eigrp 11
B.router eigrp 10
C.router eigrp 10 redistribute igrp
D.router igrp combine eigrp 10

Answer: B

If you enable EIGRP on a router with the same autonomous system (AS) number, EIGRP will automatically redistribute IGRP into EIGRP. You will see the IGRP injected routes as external (EX) routes with an EIGRP AD of 170. This is a nice feature that lets you migrate slowly to EIGRP with no extra configuration.

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A network administrator needs to configure a router with a distance-vector protocol that allows classless routing. Which of the following satisfies those requirements?

A.IGRP
B.OSPF
C.RIPv1
D.EIGRP
E.IS-IS

Answer: D

In this question, we're calling EIGRP just plain old distance vector. EIGRP is an "advanced" distance-vector routing protocol, sometimes called a hybrid routing protocol because it uses the characteristics of both distance-vector and link-state routing protocols.

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10.

You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?

A.show ip eigrp adjacency
B.show ip eigrp topology
C.show ip eigrp interfaces
D.show ip eigrp neighbors

Answer: D

Correct answer: show ip eigrp neighbors

The neighbors output lists each adjacency with the neighbour’s address, the interface, the hold time, the smoothed round trip time, the retransmit timeout and the queue count - which is precisely the set of quantities the question asks for. The topology command shows the routes learned rather than the peers, the interfaces command shows the peer count per interface, and there is no show ip eigrp adjacency.

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EIGRP and OSPF Questions and Answers

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