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Question 18 - JN0-363 discussion

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

A.
A level 1 only router can never form an adjacency with a level 2 only router.
Answers
A.
A level 1 only router can never form an adjacency with a level 2 only router.
B.
For level 2 adjacencies, the area IDs can be different.
Answers
B.
For level 2 adjacencies, the area IDs can be different.
C.
For level 2 adjacencies, the area IDs must be the same.
Answers
C.
For level 2 adjacencies, the area IDs must be the same.
D.
A level 1 only router can form an adjacency with a level 2 only router.
Answers
D.
A level 1 only router can form an adjacency with a level 2 only router.
Suggested answer: A, B

Explanation:

A Level 1 router can become adjacent with the Level 1 and Level 1-2 (L1/L2) router. A Level 2 router can become adjacent with Level 2 or Level 1-2 (L1/L2) router. There is no adjacency between L1 only and L2 only router. HOWEVER: If two routers are in different areas, they can only form a Level 2 adjacency. As such, two routers in different areas can NOT form a Level 1 adjacency. If you want two routers to form a Level 1 adjacency, they have to be in the same area.

asked 18/09/2024
Spencer Karenbauer
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