4A0-112: Nokia IS-IS Routing Protocol

By Nokia · Question Mode

QuestionQ21

SR OS Control Plane Security

A router is attempting to establish an IS-IS adjacency with the DIS over a broadcast link. Which event causes the adjacency to transition from Initializing to UP?

Explanation

For an IS-IS broadcast-LAN adjacency, the transition to Up occurs when the neighbor’s LAN IS-to-IS Hello includes the local router’s LAN address/MAC address in its neighbor list. This confirms bidirectional Hello communication; CSNP and LSP exchanges are link-state database synchronization mechanisms, not the condition for this adjacency-state transition.

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