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單項選擇題

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.

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單項選擇題

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.

單項選擇題

What is the maximum number of NET addresses supported on a virtual router?（）

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

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