Juniper Exam JN0-351 Topic 2 Question 37 Discussion

Actual exam question for Juniper's JN0-351 exam

Question #: 37
Topic #: 2

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.)

AThere are mismatched router IDs on the L2 routers.

BThere is no configured ISO address on any IS-IS interface.

CThere is a mismatched area ID between the L2 routers.

DThe family iso configuration is missing from the adjacency interface.

Show Suggested Answer

Suggested Answer: B, D

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.

by Maybelle at Jan 22, 2025, 08:12 AM

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Aleisha

11 days ago

I believe the missing family iso configuration could also be a possible reason for the adjacency problem.

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Sherrell

13 days ago

I agree with Pura, that could be one reason. But I also think the mismatched area ID could be causing the issue.

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25 days ago

Wait, wait, wait... mismatched router IDs on L2 routers? What is this, amateur hour? Clearly, the answer is C, no doubt about it.

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Roosevelt

3 days ago

C) There is a mismatched area ID between the L2 routers.

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Garry

10 days ago

A) There are mismatched router IDs on the L2 routers.

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Cecil

28 days ago

Hmm, I'd say the missing ISO address is the culprit. Without that, the routers can't even speak the same language, let alone become neighbors.

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Shawna

29 days ago

C'mon, it's gotta be the mismatched area ID! How else would those routers not be able to form an adjacency? Basic IS-IS stuff right there.

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Laquita

10 days ago

A) There are mismatched router IDs on the L2 routers.

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