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:
I think the key point here is to spot that the adjacency between R3 and R4 wont work because it’s L1 while they are in different areas.
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https://learningnetwork.cisco.com/community/certifications/ccnp/route_v2/exam-topics
IS-IS is not a part of exam topics
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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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