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Question 36 - JN0-664 discussion

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Which two statements are correct about IS-IS interfaces? (Choose two.)

A.
If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
Answers
A.
If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
B.
If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
Answers
B.
If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
C.
If a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels.
Answers
C.
If a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels.
D.
If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level
Answers
D.
If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level
Suggested answer: B, D

Explanation:

IS-IS supports two levels of routing: Level 1 (intra-area) and Level 2 (interarea). An IS-IS router can be either Level 1 only, Level 2 only, or both Level 1 and Level 2. A router that is both Level 1 and Level 2 is called a Level 1-2 router.A Level 1-2 router sends separate hello messages for each level on both point-to-point and broadcast interfaces1. A point-to-point interface provides a connection between a single source and a single destination. A broadcast interface behaves as if the router is connected to a LAN.

asked 18/09/2024
Alex Pilallis
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