Juniper Exam JN0-351 Topic 7 Question 21 Discussion

Actual exam question for Juniper's JN0-351 exam

Question #: 21
Topic #: 7

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 Freeman at Jun 23, 2024, 10:51 AM

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Mable

5 months ago

I think the correct answers are C) and D). Mixing up your router IDs and area IDs is like trying to play football with a bowling ball. Good luck with that!

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Elbert

5 months ago

B) No ISO address? That's like trying to play chess without a chessboard. How do you even IS-IS without an ISO address?

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Chauncey

4 months ago

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

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Annice

4 months ago

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

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Lashawnda

4 months ago

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

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Rosalind

4 months ago

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

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Lettie

4 months ago

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

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Brandon

4 months ago

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

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Johnna

5 months ago

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

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Eliseo

5 months ago

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

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Jolene

6 months ago

D) The missing 'family iso' configuration sounds like the culprit to me. Rookie mistake, but an easy fix!

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Louis

6 months ago

A) I think the mismatched router IDs could be the problem. That's a common issue I've encountered with IS-IS adjacencies.

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Veronique

5 months ago

B) I agree. Another common issue is a mismatched area ID between the routers. That could also be preventing the adjacency from forming.

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Viola

5 months ago

A) Yes, that could definitely be causing the problem. It's important to double check the router IDs to make sure they match.

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Huey

6 months ago

C) Definitely, the mismatched area ID is the root cause here. I've seen this issue before in my network.

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Daisy

5 months ago

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

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Melissia

5 months ago

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

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Frank

6 months ago

I think the reason could be mismatched router IDs.

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