What is the correct output of the command show ip route on router R2?

Refer to the exhibit. What is the correct output of the command show ip route on router R2?

Refer to the exhibit. What is the correct output of the command show ip route on router R2?

A.
R2# show ip route
<output omitted>
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
i L2 10.200.200.14/32 [115/20] via 10.1.2.4, Serial1/0
i L2 10.200.200.13/32 [115/30] via 10.1.0.1, Serial1/1
i L1 10.1.3.0/24 [115/20] via 10.1.2.4, Serial1/0
C 10.1.2.0/24 is directly connected, Serial1/0
i L2 10.1.1.0/24 [115/20] via 10.1.0.1, Serial1/1
C 10.1.0.0/24 is directly connected, Serial1/1

B.
R2# show ip route
<output omitted>
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
i L1 10.200.200.14/32 [115/20] via 10.1.2.4, Serial1/0
i L2 10.200.200.13/32 [115/30] via 10.1.0.1, Serial1/1
i L1 10.1.3.0/24 [115/20] via 10.1.2.4, Serial1/0
C 10.1.2.0/24 is directly connected, Serial1/0
i su 10.1.2.0/23 [115/10] via 0.0.0.0, Null0
C 10.1.0.0/24 is directly connected, Serial1/1
i L2 10.1.0.0/23 [115/20] via 10.1.0.1, Serial1/1

C.
R2# show ip route
<output omitted>
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
i L1 10.200.200.14/32 [115/20] via 10.1.2.4, Serial1/0
i L1 10.200.200.13/32 [115/30] via 10.1.2.4, Serial1/0
[115/30] via 10.1.0.1, Serial1/1
i L1 10.1.3.0/24 [115/20] via 10.1.2.4, Serial1/0
C 10.1.2.0/24 is directly connected, Serial1/0
i L1 10.1.1.0/24 [115/20] via 10.1.0.1, Serial1/1
C 10.1.0.0/24 is directly connected, Serial1/1

D.
R2# show ip route
<output omitted>
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
i L1 10.200.200.14/32 [115/20] via 10.1.2.4, Serial1/0
i L2 10.200.200.13/32 [115/30] via 10.1.0.1, Serial1/1
i L1 10.1.3.0/24 [115/20] via 10.1.2.4, Serial1/0
i L1 10.1.2.0/24 is directly connected, Serial1/0
i L2 10.1.1.0/24 [115/20] via 10.1.0.1, Serial1/1
i L2 10.1.0.0/24 is directly connected, Serial1/1

E.
R2# show ip route
<output omitted>
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
i L1 10.200.200.14/32 [115/20] via 10.1.2.4, Serial1/0
i L2 10.200.200.13/32 [115/30] via 10.1.0.1, Serial1/1
i L1 10.1.3.0/24 [115/20] via 10.1.2.4, Serial1/0
C 10.1.2.0/24 is directly connected, Serial1/0
i L2 10.1.1.0/24 [115/20] via 10.1.0.1, Serial1/1
C 10.1.0.0/24 is directly connected, Serial1/1

Explanation:

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Martin

Martin

The key here is that R1 and R2 are Level 1-2 routers while R3 and R4 are Level 1-only routers.

A Level 1 adjacency may be established if there is at least one area address in common between this system and its neighbors. Level 2 adjacencies will never be established over this interface.

A Level 1 and Level 2 adjacency is established if the neighbor is also configured as level-1-2 and there is at least one area in common. If there is no area in common, a Level 2 adjacency is established. This is the default.

Level 2 adjacencies are established if the other routers are Level 2 or Level 1-2 routers and their interfaces are configured for Level 1-2 or Level 2. Level 1 adjacencies will never be established over this interface.

Reference:http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/command/irs-cr-book/irs-a1.html#wp4043727994

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