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A、IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch. B、IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own. C、IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router. D、IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches. E、IGMP snooping is enabled with the ip multicast - routing global configuration command.
