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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
1 months 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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Ma
17 days ago
C) There is a mismatched area ID between the L2 routers.
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Lacresha
1 months ago
A) There are mismatched router IDs on the L2 routers.
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Ardella
2 months 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
2 months 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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Kenneth
26 days ago
Once you fix those issues, the routers should be able to form an adjacency and communicate properly.
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Hollis
1 months ago
It's important to make sure all the settings are consistent between the routers to avoid any problems.
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Leigha
1 months ago
I agree, having a mismatched area ID and missing family iso configuration can definitely cause adjacency issues.
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Carma
2 months 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
1 months ago
C) There is a mismatched area ID between the L2 routers.
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Erick
2 months ago
A) There are mismatched router IDs on the L2 routers.
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Jerry
2 months 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
2 months ago
I think the reason could be mismatched router IDs.
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Isreal
2 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
1 months 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
1 months ago
Once you fix those configurations, the routers should be able to form the adjacency without any problems.
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Darell
1 months 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
2 months 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
3 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
2 months ago
C) There is a mismatched area ID between the L2 routers.
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Denny
2 months ago
A) There are mismatched router IDs on the L2 routers.
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