单项选择题

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.

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单项选择题

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

单项选择题

A.per IP interface
B. per virtual router
C. only on LAN interfaces
D. only on WAN interfaces

多项选择题

A. Area ID
B. N-selector
C. System ID
D. ISO number
E. MAC address