A. 0
B. 1
C. 2
D. 3
E. 4

A. LSA 1
B. LSA 3
C. LSA 4
D. LSA 5
E. LSA 7

A. They are used to summarize area routes to other areas.
B. They are used in not-so-stubby areas to propagate external routes.
C. They are used to notify areas of the ASBR.
D. They are flooded to all areas except stub areas （external route）.

A.00000
B.12345
C.23456
D.65000
E.99999

A. The Layer 2 multicast address of the destination node
B. The solicited node multicast address of the destination node
C. The Layer 2 address of the destination node based on the destination IPv6 address
D. The IPv6 address of the destination node based on the destination Layer 2 address

A.6to4
B.6over4
C.ISATAP
D.GRE

A.0.0.0.1
B.0.255.0.1
C.2001：DB8：：1
D.2001：DB8：ABCD：FEEF：：1

A.2001：DB8：：1 and 2001：DB8：：2
B.2001：DB8：：9 and 2001：DB8：：10
C.2001：DB8：：10 and 2001：DB8：：17
D.2001：DB8：：1 and 2001：DB8：：18

A.The autoconfig command is missing from the router interface.
B.IPv6 multicast routing is not enabled on the router interface.
C.IPv6 unicast routing is not enabled on the router interface.
D.The router interface is configured with a /63 mask.
E.The router interface is configured with a /65 mask.

A. anycast address
B. site-local multicast
C. global address of the link
D. unique local address
E. link-local address

A.On-Passive
B.On-Auto
C.Passive-Active
D.Desirable-Auto
E.Active-Active
F.Desirable-Desirable