what is multicast snooping？
正确答案:IGMP snooping is a technology that Layer 2 switches can use to constrain the flooding of multicast traffic by dynamically configuring Layer 2 interfaces so that multicast traffic is forwarded to only those interfaces associated with IP multicast group members. IGMP snooping requires the switch to examine， or “snoop，” some Layer 3 information in the IGMP packets sent between the hosts and the router.
答案解析:有
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