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Question 12 - JN0-351 discussion

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You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

A.
MTU is not at least 1492 bytes.
Answers
A.
MTU is not at least 1492 bytes.
B.
IP subnets are not a /30 address.
Answers
B.
IP subnets are not a /30 address.
C.
The Level 2 routers have mismatched areas.
Answers
C.
The Level 2 routers have mismatched areas.
D.
The lo0 interface is not included as an IS-IS interface.
Answers
D.
The lo0 interface is not included as an IS-IS interface.
Suggested answer: A, D

Explanation:

Option A suggests that the MTU is not at least 1492 bytes.This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies1.If the MTU is less than this, IS-IS adjacencies will not be established1.

Option D suggests that the lo0 interface is not included as an IS-IS interface.This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS1.If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established1.

Therefore, options A and D are correct.

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asked 18/09/2024
Chris OMalley
26 questions
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