642-902 Q&A – Implement a multi-area OSPF Network (36-40)

Section 2 – Implement a multi-area OSPF Network, given a network design and a set of requirements

QUESTION NO: 36
A network administrator has enabled OSPF across an NBMA network and has issued the command ip ospf network nonbroadcast. Given those facts, which two statements are true? (Choose two.)
A. Interfaces will automatically detect and build adjacencies with neighbor routers.
B. DR and BDR elections will not occur.
C. DR and BDR elections will occur.
D. The neighbor command is required to build adjacencies.
E. All routers must be configured in a fully meshed topology with all other routers.
Answer: C,D

QUESTION NO: 37
An administrator types in the command router ospf 1 and receives the error message: "OSPF process 1 cannot start." (Output is omitted.) What should be done to correctly set up OSPF?
A. Ensure that an interface has been configured with an IP address.
B. Ensure that IP classless is enabled.
C. Ensure that the interfaces can ping their directly connected neighbors.
D. Ensure that an interface has been configured with an IP address and is up.
Answer: D

QUESTION NO: 38
Refer to the exhibit. What additional commands should be used to configure OSPF area 5 as a Totally Stubby area?

image
A. area 0 stub on routers R4 and R5
B. area 5 stub on routers R4 and R5
C. area 5 stub no-summary on routers R4 and R5
D. area 0 stub no-summary on router R4 and area 5 stub no-summary on router R5
E. area 5 stub no-summary on router R4 and area 5 stub on router R5
Answer: E
Explanation:
The point of the question is the configuration of totally stub.
From this picture, we can find that R4 is an ABR, network 10.1.45.0/24 is in area 5. We have two commands to configure totally stub.
First: area 5 stub no-summary, it’s on ABR.

QUESTION NO: 39
To make OSPF area 4 totally stubby, the following command was issued on the ABR in router configuration mode: area 4 stub
Which two things need to be done to finish making area 4 a totally stubby area? (Choose two.) Select 2 response(s).
A. Apply the area 4 stub command to all routers in the area.
B. On the ABR, use the area 4 stub command with the no-summary keyword.
C. On the ABR, specify a default cost for the area with the area default-cost command.
D. On the ABR, use the default-information originate command to inject a default route into area 4.
E. Use the auto-cost command on each router in the area to automatically determine the cost to other OSPF areas.
Answer: A,B

QUESTION NO: 40
Refer to the exhibit. On the basis of the configuration provided, how are the Hello packets sent by R2 handled by R5 in OSPF area 5? Select the best response.

image
A. The Hello packets will be exchanged and adjacency will be established between routers R2 and R5.
B. The Hello packets will be exchanged but the routers R2 and R5 will become neighbors only.
C. The Hello packets will be dropped and no adjacency will be established between routers R2 and R5.
D. The Hello packets will be dropped but the routers R2 and R5 will become neighbors.
Answer: C
Explanation:
The point of this question is the conditions of OSPF establish adjacency relationship.
For ospf, the optional capabilities must set the same between neighbors,but from the exhibit, R5 was configured as a stub area while R2 in area 0 is a normal areA. So there will be no adjacent relationship established between routers R2 and R5.

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