多选题Which three IP multicast group concepts are true?（）AIf a packet is sent to a multicast group address, the multicast frame contains the source multicast address.BA router does not have to be a member of a multicast group to recei ve multicast data.CA router must be a member of a multicast group to send to the group.DA router does not have to be a member of a multicast group to send to the group.EIf a packet is sent to a multicast group address, all members of the multic ast group will receive it.FA router must be a member of a multicast group to receive multicast data.
多选题
Which three IP multicast group concepts are true?（）
A
If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
B
A router does not have to be a member of a multicast group to recei ve multicast data.
C
A router must be a member of a multicast group to send to the group.
D
A router does not have to be a member of a multicast group to send to the group.
E
If a packet is sent to a multicast group address, all members of the multic ast group will receive it.
F
A router must be a member of a multicast group to receive multicast data.
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