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Question 118 - 300-420 discussion

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An engineer is creating a design to enable IPv6 to run on an existing IPv4 IS-IS network. The IPv4 and IPv6 topologies will match exactly, and the engineer plans to use the same router levels for each protocol per interface. Which IS-IS design is required?

A.

single topology without enabling transition feature

Answers
A.

single topology without enabling transition feature

B.

single topology with transition feature enabled

Answers
B.

single topology with transition feature enabled

C.

multi topology with transition feature enabled

Answers
C.

multi topology with transition feature enabled

D.

multi topology without enabling transition feature

Answers
D.

multi topology without enabling transition feature

Suggested answer: B

Explanation:

For single-topology IS-IS IPv6, routers must be configured to run the same set of address families. IS- IS performs consistency checks on hello packets and will reject hello packets that do not have the same set of configured address families. For example, a router running IS-IS for both IPv4 and IPv6 will not form an adjacency with a router running IS-IS for IPv4 or IPv6 only. In order to allow adjacency to be formed in mismatched address-families network, the adjacency-check command in IPv6 address family configuration mode must be disabled.

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asked 07/10/2024
Scott Albee
34 questions
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