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Question 58 - JN0-351 discussion

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You are an operator for a network running 1S-IS. Two routers are failing to form an adjacency. What are two reasons for this problem? (Choose two.)

A.
There are mismatched router IDs on the L2 routers.
Answers
A.
There are mismatched router IDs on the L2 routers.
B.
There is no configured ISO address on any IS-IS interface.
Answers
B.
There is no configured ISO address on any IS-IS interface.
C.
There is a mismatched area ID between the L2 routers.
Answers
C.
There is a mismatched area ID between the L2 routers.
D.
The family iso configuration is missing from the adjacency interface.
Answers
D.
The family iso configuration is missing from the adjacency interface.
Suggested answer: B, D

Explanation:

The two reasons for the failure to form an adjacency in a network running IS-IS could be:

B) There is no configured ISO address on any IS-IS interface.IS-IS requires each router interface to have an ISO address configured.Without this address, the routers cannot form an adjacency1.

D) The family iso configuration is missing from the adjacency interface.The 'family iso' configuration is essential for IS-IS to function correctly.If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency1.

These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks23.

asked 18/09/2024
Solomon Nidish
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