A. CPE

B. P

C. PE

D. User router

A. In the assert mechanism, the winner forwards multicast data to the broadcast network

B. The assert mechanism is used for DR election

C. In the assert mechanism, the loser shutdown the interface connected to the broadcast network

D. IP addresses are not used for winner election

A. ISIS, route infiltration The route before infiltration cannot be an aggregated route.

B. ISIS route penetration is used to prevent routing loops.

C. ISIS IPv6 route penetration can be used under the ring.

D. ISIS Level--1 route penetration can be deployed on the router at the level.

E. The route penetration of ISIS will not cause the earthquake to be adjacent.

A. Two routers are divided into configuration areas and interfaces. Authentication and authentication are the same. Then two routers can establish a neighbor relationship.

B. After the configuration area is authenticated, the router sends out the IIH SNP LSP, and must carry the authentication.

C. Interface can be authenticated to achieve Level-1 Level-2 hello and document authentication.

D. After the interface is configured for authentication, the router sends out the IIH TLV with certain authentication.

A. Host ARP advertisement

B. BUM packet forwarding

C. Host MAC address advertisement

D. Host IP route advertisement