What are three reasons a router would send out an IS-IS link-state PDU? (Choose three.)
What are three reasons a router would send out an IS-IS link-state PDU? (Choose three.)
A . A new external route is imported from BGP.
B. The router’s link to a neighbor goes down.
C. A new neighbor exists on the link.
D. The cost of a link to an existing neighbor has changed.
E. IS-IS sends link-state PDUs at random intervals.
Answer: B,C,D
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