EIGRP and OSPF - EIGRP and OSPF

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: Option D

Explanation:

The show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit interval and queue counts for the neighbors that have established an adjacency.

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

Broadcast multi-access
Non-broadcast multi-access
Point-to-point
Broadcast multipoint

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

Answer: Option A

Explanation:

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.

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

Broadcast
Point-to-point
NBMA
NBMA point-to-point

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

Answer: Option B

Explanation:

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.

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: Option A

Explanation:

The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255.

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

RIPv1
IGRP
EIGRP
OSPF
BGP
RIPv2

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

Answer: Option C

Explanation:

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.

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

A.	The lowest IP address of any physical interface
B.	The highest IP address of any physical interface
C.	The lowest IP address of any logical interface
D.	The highest IP address of any logical interface

Answer: Option B

Explanation:

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router. If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

Which two of the following commands will place network 10.2.3.0/24 into area 0?

router eigrp 10
router ospf 10
network 10.0.0.0
network 10.2.3.0 0.0.0.255 area0
network 10.2.3.0 0.0.0.255 area 0

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

Answer: Option C

Explanation:

To enable OSPF, you must first start OSPF using a Process ID. The number is irrelevant; just choose a number from 1 to 65,535 and you're good to go. After you start the OSPF process, you must configure any network that you want advertised via OSPF using wildcards and the area command. Statement (4) is wrong because there must be a space after the parameter area and before you list the area number.

What are reasons for creating OSPF in a hierarchical design?

To decrease routing overhead
To speed up convergence
To confine network instability to single areas of the network
To make configuring OSPF easier

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

Answer: Option A

Explanation:

OSPF is created in a hierarchical design, not a flat design like RIP. This decreases routing overhead, speeds up convergence, and confines network instability to a single area of the network.

EIGRP and OSPF - EIGRP and OSPF

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