单项选择题

Which IS-IS authentication method is supported on the ERX Edge Router?（）

A. simple password
B. HMAC message digest 5
C. Password Authentication Protocol
D. Challenge Handshake Authentication Protocol

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单项选择题

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

单项选择题

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.

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.