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Juniper Exam JN0-351 Topic 3 Question 35 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 35
Topic #: 3
[All JN0-351 Questions]

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.)

Show Suggested Answer Hide 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 Marion at Dec 07, 2024, 03:30 AM

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Laticia
11 days ago
This is a classic case of 'read the manual, not the tea leaves'. C and D are the answers, no doubt. Though I do wonder if the routers are also arguing about which Star Trek movie is the best...
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Lacresha
3 days ago
A) There are mismatched router IDs on the L2 routers.
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Ardella
18 days ago
I believe the missing ISO address on any IS-IS interface could also be a possible reason for the adjacency problem.
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Mariko
19 days ago
Ah, the joys of troubleshooting IS-IS. I'd go with C and D - can't have those routers talking if they're not on the same page with their area and ISO settings.
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Hollis
12 days ago
It's important to make sure all the settings are consistent between the routers to avoid any problems.
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Leigha
13 days ago
I agree, having a mismatched area ID and missing family iso configuration can definitely cause adjacency issues.
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Carma
25 days ago
Definitely C and D. Mismatched area ID and missing family iso? That'll shut down your IS-IS adjacency faster than you can say 'routing protocol'.
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Corinne
12 days ago
C) There is a mismatched area ID between the L2 routers.
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Erick
14 days ago
A) There are mismatched router IDs on the L2 routers.
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Jerry
29 days ago
I agree with Ruthann, that could be one reason. But I also think the mismatched area ID could be causing the issue.
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Ruthann
1 months ago
I think the reason could be mismatched router IDs.
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Isreal
1 months ago
B and C, for sure. You can't form an adjacency without the proper ISO configuration on those interfaces.
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Rossana
6 days ago
If you're still having trouble after checking B and C, then it might be worth looking into the router IDs as well.
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Karol
9 days ago
Once you fix those configurations, the routers should be able to form the adjacency without any problems.
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Darell
12 days ago
Make sure to check the family iso configuration on the adjacency interface as well. That could be causing the issue.
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Bok
17 days ago
B and C are definitely the reasons. The ISO address and area ID need to match for the adjacency to form.
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Aliza
2 months ago
C and D seem like the most likely culprits to me. Gotta have that area ID and ISO address configured correctly!
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Evelynn
14 days ago
C) There is a mismatched area ID between the L2 routers.
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Denny
18 days ago
A) There are mismatched router IDs on the L2 routers.
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