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Which expected route is missing from R1s route table based on the topology during the maintenance period?

The company and the company network have both been growing rapidly. Multiple adds,
moves and changes have been applied to the network.Your boss 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.

Refer to the information above to answer the following question.
The R2 router has lost connectivity to R1. The following is R1s current route table:
176.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
O IA 172.16.230.0/24 [110/21] via 10.138.43.1, 00:00:03,
FastEthernet0/0
O IA 172.16.209.0/24 [110/22] via 10.138.43.1, 00:00:03,
FastEthernet0/0
O IA 172.16.1.0/30 [110/21] via 10.138.43.1, 00:00:03,
FastEthernet0/0
10.0.0.0/30 is subnetted, 1 subnets
C 10.138.43.0 is directly connected, FastEthernet0/0
Which expected route is missing from R1s route table based on the topology during the
maintenance period?’
Select the best response.

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A.
O 172.16.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0

B.
O IA 9.152.105.122 [110/3] via 10.138.43.1, 00:00:09,
FastEthernet0/0

C.
O IA 10.138.0.0 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0

D.
O IA 10.249.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0

E.
O IA 4.249.113.59 [110/2] via 10.138.43.1, 00:00:09,
FastEthernet0/0

F.
O 8.187.175.82 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0

G.
O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09,
FastEthernet0/0

H.
O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09,
FastEthernet0/0

Explanation:
In the past, I used to choose answer F as the correct answer but the explanation from
DOX3003 (commented on November 19th, 2010) seems tobe correct:
“Which expected route is missing from R1′s route table based on the topology during the
maintenance period?
X…….
X. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
X. O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
X…….
You can see there are 2 options for the network between D2 and R2. One with “IA” and one
without. O – OSPF, IA – OSPF inter area.
Before link failures between D1 and D2 the network 10.206.180.0/30 has been appearing
as “intra area” network in R1′s routing table.
Because they were in the same Area 0.
So the correct answer should be
X. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0″”


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