多项选择题

Which two statements are true by default of a multilevel IS-IS network?（）

A. Level 1 only routers see routes contained in their area.
B. Level 1 routers route towards Level 2 routers due to the attached bit.
C. Level 2 routers route towards Level 1 routers due to the attached bit.
D. Level 2 routers can see routes in other Level 2 areas and routes originated in Level 1 areas.

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单项选择题

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

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

单项选择题

A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. Which action will the router take?（）

A. Forward the packet.
B. Fragment the packet.
C. Drop the packet silently.
D. Drop the packet and send an ICMPv6 message.

多项选择题

Which two MBGP IPv4 sub-AFIs does the JUNOS software support?（）

A.unicast
B.anycast
C.multicast
D.broadcast