642-902 Q&A – Implement a multi-area OSPF Network (41-45)

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

QUESTION NO: 41
What is the best order for choosing the Router-ID in ospf?
A. high loopback interface address, high physical interface address, Router ID command
B. high loopback interface address, Router ID command, high physical interface address
C. Router ID command, high loopback interface address, high physical interface address
D. Router ID command, high physical interface address, high loopback interface address
E. high physical interface address, high loopback interface address, Router ID command
Answer: C

QUESTION NO: 42
Refer to the exhibit. Router B is performing bidirectional redistribution between EIGRP and OSPF.
The network 10.100.1.0/24 should not be reachable from the 10.100.9.0/24 network. However, it needs to be reachable from any network within the EIGRP domain. All other networks should be seen in both domains. Which change to router B would accomplish these goals?
Select the best response.

42
A. Under the EIGRP process, insert the distribute-list block_net_1 out ospf 1 command.
B. Under the OSPF process, insert the distribute-list block_net_1 in serial1/0 command.
C. Under the EIGRP process, insert the distribute-list block_net_1 in serial1/0 command.
D. Under the OSPF process, insert the distribute-list block_net_1 out eigrp 1 command.
Answer: D

QUESTION NO: 43
The following exhibit shows ipv6 route output. What would the metric be for a summary route that summarizes all three OSPFv3 routes displayed?

43
A. 160
B. 140
C. 120
D. 100
Answer: D
Explanation:
The cost of the summarized routes is the highest cost of the routes being summarized. In fact, in the old RFC 1583 standard, the cost of the summary route was the cost of the lowest metric. But when OSPF was updated in RFC 2178 and RFC 2328, the summary route should have the same cost as the highest-cost summarized route. In this case, the highest-cost is 100 according to the second entry.

QUESTION NO: 44
Refer to the exhibit. ROUTE.com is planning to implement a new secure OSPF network to support traffic between clients on the 172.16.10.0/24 network and the file server on the 172.16.20./24 network. You have been asked to review the implementation plan for the OSPF project. Which statement about the plan is true? Select the best response.

44
A. It is complete as written.
B. It should include a task that shuts down all unused interfaces.
C. It should include tasks that enable and verify OSPF authentication.
D. It should include a task that establishes a file transfer baseline before and after the configuration is changed.
Answer: C

QUESTION NO: 45
Refer to the exhibit. Will redistributed RIP routes from OSPF Area 2 be allowed in Area 1?

45
A. RIP routes will be allowed in Area 1 only if they are first redistributed into EIGRP.
B. Because NSSA will discard type 7 LSAs, redistributed RIP routes will not be allowed in Area 1.
C. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 5 LSAs in Area 0 and passed on into Area 1.
D. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 7 LSAs in Area 0 and passed on into Area 1.
E. Because Area 1 is an NSSA, redistributed RIP routes will not be allowed.
Answer: E
Explanation:
The following are several area types that are possible on OSPF: Standard area – A standard area
can accept link updates and route summaries. Backbone area (transit area) – When interconnecting multiple areas, the backbone area is the central entity to which all other areas connect. The backbone area is always Area 0. All other areas must connect to this area to exchange route information. The OSPF backbone has all the properties of a standard OSPF area-A.
Stub area-A stub area is an area that does not accept information about routes external to the autonomous system, the OSPF internetwork, such as routes from non-OSPF sources. If routers need to reach networks outside the autonomous system, they use a default route. A default route is noted as 0.0.0.0/0. Totally stubby area – A totally stubby area is an area that does not accept external autonomous system (AS) routes and summary routes from other areas internal to the autonomous system. Instead, if the router needs to send a packet to a network external to the area, it sends it using a 0.0.0.0/0 default route. Totally stubby areas are a Cisco proprietary feature. Not-so-stubby area (NSSA) – An NSSA is an area that is similar to a stub area but allows for importing external routes as Type 7 LSAs and translation of specific Type 7 LSA routes into Type 5 LSAs.

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