A.If the R2 Ethernet 0/0/1 interface is down, the R1 BFD session can quickly detect the fault and notify R1 to make the OSPF neighbor relationship down.

B.If the BFD function is disabled on R2, the BFD session on R1 will be down. This will result in the ospf neighbor relationship down.

C.If the R2 Ethernet0/0/0 interface is down, the next hop of the route that R1 reaches 10.0.0.2 is changed to 10.0.21.2.

D.The OSPF status changes to FULL, which triggers the BFD session.

E.If the R2 Ethernet 0/0/1 interface is down, the next hop of the route that R1 reaches 10.0.0.2 is changed to 10.0.12.2.

A.Both the serial number and age parameters can determine the old and new LSA, the router will give priority to the sequence to participate in the teaching, the larger the better

B.If the sequence number of the LSA reaches the end value Ox7FFFFFFF, the current router advertises the LSA whose age is 3600S

C.When the router receives two LSAs with the same sequence number and the same checksum, the smaller the age, the better

D.When the router receives an LSA, the age is set to 3600S, indicating that this LSA is unavailable

A.When sending a neighbor solicitation message, the destination address must be the neighbor's solicited node multicast address

B.When sending a neighbor solicitation message, the source address must be the link-local address of the local interface

C.Two ICMPv6 messages, neighbor solicitation and neighbor advertisement, are used in the address resolution process

D.Address resolution realizes the function from IPv6 address resolution to link layer address

A.Configure an intelligent timer generated by the LSP, which can automatically adjust the delay time according to the change frequency of the routing information.

B.The LSP fast flooding feature first spreads out LSPs smaller than the specified number to speed up the synchronization process of the LSDB.

C.Reduce the minimum interval for sending LSPs on an interface to speed up LSP diffusion.

D.When the link state information increases, the packet length of the SP can be increased, so that each LSP can carry more information.

A.Type1

B.Type2

C.Type4

D.Type3

E.Type5