642-902 Q&A – Implement a multi-area OSPF Network (1-5)

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

QUESTION NO: 1
Refer to the exhibit. A network administrator wants to reduce the number of OSPF routes advertised from Area 1 into Area 2. As the router configuration specialist, what two things would you do to accomplish this goal? (Choose two.)

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A. Enter the configuration on router B1.
B. Enter the configuration on router B4.
C. On the same router, enter the Summary-address 10.10.1.0 255.255.255.128 subcommand.
D. On the same router, enter the Area 1 range 10.10.1.0 255.255.255.128 subcommand.
E. On the same router, enter the Area 2 range 10.10.1.0 255.255.255.128 subcommand.
Answer: A,D

QUESTION NO: 2
Refer to the exhibit. Two routers are connected by Frame Relay and are running OSPF between them. Each router has been configured with the appropriate network statements under router ospf 1, but the routers are not forming an adjacency. Which of the following three commands could be configured on each router to correct this problem? Select 3 response(s).

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A. RouterC(config-if)#ip ospf network broadcast
RouterD(config-if)#ip ospf network broadcast
B. RouterC(config-if)#ip ospf network point-to-point
RouterD(config-if)#ip ospf network point-to-point
C. RouterC(config-router)#neighbor 10.100.100.4
RouterD(config-router)#neighbor 10.100.100.3
D. RouterC(config-router)#neighbor 10.255.255.254
RouterD(config-router)#neighbor 10.255.255.253
Answer: A,B,D

QUESTION NO: 3
Which statement is correct based upon the following output from the show command on RT1?

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A. OSPFv3 establishes neighbor adjacencies by using global IPv6 addresses.
B. OSPFv3 establishes neighbor adjacencies by using Link-local addresses.
C. RT1 owns a subnet mask of 64 bits.
D. OSPFv3 establishes neighbor adjacencies by using IPv4 addresses.
Answer: B
Explanation:
The point of this question is the OSPFv3.
As shown information, we notice that the router with both ipv6 address and ipv4 address and both of them are in ospf prosess, so in OSPFv3, we can find that, the DR BDR address are all link local address, so in OSPFv3 it establist neighbor with link local address.

QUESTION NO: 4
Refer to the exhibit. During the process of configuring a virtual link to connect area 2 with the backbone area, the network administrator received this console message on R3:

*Mar 1 00:25:01.084: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0

How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?

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A. R1(config-router)# area 0 virtual-link 1.1.1.1
R3(config-router)# area 2 virtual-link 3.3.3.3
B. R1(config-router)# area 1 virtual-link 2.2.2.2
R3(config-router)# area 1 virtual-link 2.2.2.2
C. R1(config-router)# area 1 virtual-link 20.20.20.2
R3(config-router)# area 1 virtual-link 30.30.30.2
D. R1(config-router)# area 1 virtual-link 30.30.30.3
R3(config-router)# area 1 virtual-link 20.20.20.1
E. R1(config-router)# area 1 virtual-link 3.3.3.3
R3(config-router)# area 1 virtual-link 1.1.1.1
Answer: E

QUESTION NO: 5
The maximum number of routers per OSPF area typically depends on which three factors? Select 3 response(s).
A. the kind of OSPF areas being implemented
B. the number of external LSAs in the network
C. the number of DRs and BDRs in the areas
D. the number of virtual links in the areas
E. how well the areas can be summarized
F. the use of LSA filters
Answer: A,B,E

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