A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from “Initializing” to “UP”?
A.
Receiving a Hello packet from the DIS that contains the local router’s own MAC address in the neighbor list.
B.
Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS’s link-state database.
C.
Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from theInitializingstate to theUPstate occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
TheCSNP (Complete Sequence Number PDU)packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from theDIS (Designated Intermediate System)that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.
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