A.Solve the problem of multicast data message broadcasting on Layer 2 devices, which is used to manage and control the forwarding of multicast data messages

B.IGMP Report message legality issue

C.The receiver host only supports the IGMPv2 protocol, but the SSM multicast model is used in the network

D.There are a large number of receiver hosts on the network segment, and the router will receive a large number of IGMP Report messages.

A.The ls-ls protocol is a link state protocol running between ASs

B.IS-IS protocol supports IP network

C.IS-IS protocol supports CLNP network

D.IS-IS protocol packets are directly encapsulated by the data link layer