CCNP Composite(642-892) Hotspot 3 – OSPF

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There is a hotspot question in the CCNP exam.

The company and the company network have both been growing rapidly. Multiple adds, moves and changes have been applied to the network. Your boss at Certkiller .com, Miss Certkiller, has asked you to troubleshoot a recent synchronization problem that has arisen. There have been synchronization problems at separate locations in the area 0. There have been reported link failures during the rapid growth of the company network. You are required to resolve the problem. must be able to converge when the network changes.
Refer to the information above to answer the following 4 questions:

Question 1 :
Examine the following excerpt from the "show ip ospf" command on Certkiller A:

Area BACKBONE (0)
Number of interfaces in the this area is 1
Area has no authentication
SPF algorithm last executed 00:00:31.280 ago
SPF algorithm executed 5 times
Area ranges are
Number of LSA 13. Checksum Sum 0x16F0FD
Number of opaque link LSA 0. Checksum Sum 0×000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 16
Number of interfaces in this area is 2
Area has message digest authentication
SPF algorithm last executed 00:00:34.928 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 5. Checksum Sum 0x02FCD3
Number of opaque link LSA 0. Checksum Sum 0×000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0

Based on the information shown above, what is most likely causing the different missing routes throughout the network?

A. Area 16 is configured with authentication.
B. Area 16 has been configured to use the same interfaces as Area 0.
C. Area 0 and Area 32 have been configured with mismatched LSA numbers.
D. Area 16 has been configured as a total stub network
E. Area 16 has been configured as a stub network
F. Area 0 is discontiguous.
G. None of the above

Explanation:
In this example, Certkiller1 shows that it only has 1 interface in area 0, while the network diagram shows that there should be two. This means that the Fa0/1 link is most likely gone down, creating a discontiguous backbone area. The link needs to be restored, or a virtual link needs to be created to fix this.

Question 2 :
Which configuration command on Certkiller 1 (with a similar command on Certkiller 2) will provide an immediate solution to the missing route problem?

A. no area 16 stub
B. no area 16 authentication message-digest
C. area 16 virtual-link 8.187.175.82
D. area 16 virtual-link 172.16.4.2
E. no area 16 stub no-summary
F. network 172.16.0.0.0.0.255.255 area 16
G. None of the above

Explanation:
A virtual link to an IP address (the loopback IP address in this case) on device Certkiller2 needs to be created. Similarly,Certkiller2 needs to also have this configured so that a virtual link to area 0 from area 16 can be created

Question 3:
The log of Certkiller 1 reports the following:

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
%LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down
%OSPF-5-ADJCHG: Process 1, Nbr 8.187.175.82/32 on FasstEthernet0/1 from FULL to DOWN,
Neighbor Down: Interface down or detached

This event was anticipated due to maintenance; however, it resulted in excessive lost routes. Which route should be the only one removed from the routing tables of the routers?

A. 8.187.175.82/32
B. 10.138.43.0/30
C. 10.206.180.0/30
D. 4.249.113.59/32
E. 10.201.0.0/30
F. None of the above

Explanation:
The FastEthernet 0/1 link was the only physical link that went down, so in this case the network administrator had meant to only remove the 10.201.1.10/30 route associated with that link. However, the loopback IP address of Certkiller 2 is 8.187.175.82/32, which means that the neighbor relationship is down. When the FE 0/1 interface goes down, area 0 will effectively be cut in half creating a discontiguous backbone area.

Question 4:
The Certkiller 2 Router has lost connectivity to Certkiller 1. The following is Certkiller 1′s current route table:

172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
O IA 172.16.240.0/24 [110/11] via 10.218.67.1, 00:00:03, FastEthernet0/0
O IA 172.16.209.0/24 [110/12] via 10.218.67.1, 00:00:03, FastEthernet0/0
O IA 172.16.4.0/30 [110/2] via 10.218.67.1, 00:00:03, FastEthernet0/0
10.0.0.0/30 is subnetted, 1 subnets
C 10.218.67.0 is directly connected, FastEthernet0/0

Which expected route is missing from Certkiller 1′s route table based on the topology during the maintenance period?’

A. o 172.16.0.0 [110/2] via 10.218.67.1, 00:00:09, FastEthernet0/0
B. o IA 9.152.105.122 [110/3] via 10.218.67.1, 00:00:09, FastEthernet0/0
C. o IA 10.138.0.0 [110/3] via 10.218.67.1, 00:00:09, FastEthernet0/0
D. o IA 10.249.0.0 [110/2] via 10.218.67.1, 00:00:09, FastEthernet0/0
E. o IA 4.249.113.59 [110/2] via 10.218.67.1, 00:00:09, FastEthernet0/0
F. o 8.187.175.82 [110/3] via 10.218.67.1, 00:00:09, FastEthernet0/0

Explanation:
In this case, the missing route is the route to the loopback IP address of Certkiller 2. This loopback IP address was used for the virtual link, which was needed when the backbone area became discontiguous. If this route was missing, the virtual link would then go down and cause the additional routes to be missing.

That is all, hope to helpful for you. Best Luck for ur Composite 642-892 Exam.

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