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.

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单项选择题

What is the maximum metric value that can be reported in a narrow metric TLV？（）

A.63
B.64
C.1023
D.1024
E.65535

单项选择题

According to JUNOS software route selection algorithm， which IS-IS route type is most preferred？（）

A.Level 1 internal routes
B.Level 1 external routes
C.Level 2 internal routes
D.Level 2 external routes

单项选择题

An IS-IS router is adjacent to and passing traffic with a neighbor. You perform a show is interface detail command and notice that for some interfaces you have a circuit type of 3. Which IS-IS level（s） is enabled on these interfaces？（）

A.Level 1 only
B.Level 2 only
C.Level 1 and Level 2
D.Level 3 only