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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.

The head office has many connected subnetworks, so it will typically have adefault routeto forward traffic to the branch office (or external networks), since it may not need to define static routes for each branch network.

The branch office, which has only one subnetwork and a single connection to the head office, will have aspecific static routeto reach the head office subnet or other subnets at the head office, since it only needs to know the specific route to reach the head office's network.