單項(xiàng)選擇題

Routers A and B are connected with a point-to-point OC-3 interface. Each router's OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in the same area.
How many IS-IS adjacencies exist between the two routers?（）

A.0
B.1
C.2
D.3

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單項(xiàng)選擇題

Two Level 1 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?（）

A. An Adjacency is formed.
B. No IS-IS PDUs are sent
C. An Adjacency does not form.
D. An Adjacency forms but traffic is not forwarded.

單項(xiàng)選擇題

Two Level 2 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?（）

A. An Adjacency is formed.
B. No IS-IS PDUs are sent.
C. An Adjacency does not form.
D. An Adjacency forms but traffic is not forwarded.