多项选择题

Which two IS-IS hello values must match to form a Level 1 IS-IS adjacency？（）

A.AFI
B.Area
C.System ID
D.N-Selector

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单项选择题

Which command at the [edit protocols isis] hierarchy level forces routed traffic to avoid this router？（）

A.metric 64
B.overload
C.priority 0
D.te-metric 32768

多项选择题

Which two statements about IS reachability TLV （TLV 2） and the extended IS reachability （TLV 22） are true？（）

A.TLV 22 supports wide metrics.
B.TLV 2 is only used in Level 1 routers.
C.TLV 22 displays the neighbor’s extended areas.
D.Only TLV 22 can support the inclusion of sub-TLVs.
E. Only TLV 22 can be flooded across L1/L2 boundaries.

单项选择题

In IS-IS， how long will the restart helper keep the restarting router in the up state？（）

A.The hello dead timer expires.
B.The restart duration timer expires.
C.The restarting router sets the down bit.
D.The restart helper sends out three CSNPs.