CCNP ROUTE(642-902) Hotspot – OSPF

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 ccnproute.net, Miss ccnproute, has asked you to troubleshoot a recent OSPF synchronization problem that has arisen. There have been synchronization problems at separate locations in the OSPF area 0. There have been reported link failures during the rapid growth of the company network. You are required to resolve the OSPF problem. OSPF must be able to converge when the network changes.

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Refer to the information above to answer the following 4 questions:
Question 1 :
Examine the following excerpt from the "show ip ospf" command on D1:
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 0x000000
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 0x000000
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
Correct Answer: F
Explanation:
In this example, R1 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 R1 (with a similar command on R2) 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
Correct Answer: C
Explanation:
A virtual link to an IP address (the loopback IP address in this case) on device R2 needs to be created. Similarly,R2 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 R1 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
Correct Answer: E
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 R2 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 R2 Router has lost connectivity to R1. The following is R1’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 R1’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
Correct Answer: F
Explanation:
In this case, the missing route is the route to the loopback IP address of R2. 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.

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One thought on “CCNP ROUTE(642-902) Hotspot – OSPF

  1. Can’t give an answer to Q4, since most routes in both question and answer are not on the picture.

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