642-902 Q&A – Implement a multi-area OSPF Network (51-55)

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

QUESTION NO: 51
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. DR and BDR elections will occur.
B. DR and BDR elections will not occur.
C. All routers must be configured in a fully meshed topology with all other routers.
D. The neighbor command is required to build adjacencies.
E. Interfaces will automatically detect and build adjacencies with neighbor routers.
Answer: AD

QUESTION NO: 52
When other routing protocol routes are being redistributed into OSPF, what is one of the most common problems? Select the best response.
A. missing the tag option in the redistribute command.
B. missing the subnet option in the redistribute command.
C. missing the metric option in the redistribute command.
D. misconfiguring the metric-type option in the redistribute command to type-1.
E. misconfiguring the metric-type option in the redistribute command to type-2.
Answer: B
Explanation:
The point of this question is about the redistribution of OSPF.
To redistribute routes from one routing domain into another routing domain, use the redistribute command in router configuration mode.
redistribute protocol [process-id] {level-1 | level-1-2 | level-2} [as-number] [metric {metric-value | transparent}] [metric-type type-value] [match {internal |
external 1 | external 2}] [tag tag-value] [route-map map-tag] [subnets]
The subnets keyword tells OSPF to redistribute all subnet routes. Without the subnets keyword,

QUESTION NO: 53
Which show command will display only the Type 5 LSAs in the OSPF topology database? Select the best response.
A. show ip route
B. show ip route ospf
C. show ip ospf database summary
D. show ip ospf database nssa-external
E. show ip ospf database external
Answer: E

QUESTION NO: 54
When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers? Select the best response.
A. OSPF process ID
B. OSPF router ID
C. OSPF network type
D. OSPF memory usage
E. OSPF CPU utilization
F. OSPF stub area configurations
Answer: B

QUESTION NO: 55
The Dev-1 and Dev-3 routers are OSPF neighbors over the Ethernet 0/0 connection. Based on the show ip ospf neighbor output from the Dev-1 and Dev-3 routers, which statement is true? Select the best response.

55
A. Dev-1 is the DR because it has a higher OSPF router priority.
B. Dev-1 is the DR because it has a lower OSPF router ID.
C. Dev-3 is the DR because it has a higher OSPF router priority.
D. Dev-3 is the DR because it has a lower OSPF router ID.
E. Both Dev-1 and Dev-3 are using the default OSPF router priority.
Answer: A
Explanation:
The output shown above displays information about the neighbors, so from Dev-3 we see that the priority of Dev-1 is 2, and that Dev-1 is the DR. From Dev-1 we can see that its neighbor (Dev-3) is the BDR and has an OSPF priority of 1.

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