QuestionQ16

Intermediate System to Intermediate System (IS-IS)

Which IS-IS adjacency state indicates that hello packets have been exchanged, but the adjacency is not yet fully established?

  • A two-way
  • B loading
  • C initializing
  • D up
Explanation

The Initializing state indicates that a router has successfully received IS-IS hello packets from its neighbor but has not yet confirmed bidirectional hello reception. The adjacency becomes Up only after that confirmation. Cisco documents IS-IS adjacency states as Down, Initializing, and Up.

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