Which statement about IS-IS adjacencies is true?

Question

Options

• AAdjacency formation between Level 2 routers must have different area IDs.
• BAdjacency formation between Level 2 routers must have the same area ID.
• CAdjacency formation between Level 1 routers must have the same area ID.
• DAdjacency formation between Level 1 routers must have different area IDs.

• A
  9% (4)
• B
  5% (2)
• C
  84% (36)
• D
  2% (1)

Explanation

IS-IS hello PDUs establish adjacencies with other routers and have three different formats: one for point-to-point hello packets, one for Level 1 broadcast links, and one for Level 2 broadcast links. Level 1 routers must share the same area address to form an adjacency, while Level 2 routers do not have this limitation.

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