Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）
- A、IGMP
- B、IGMP snooping
- C、PIM - DM
- D、DVMRP
- E、MOS PF
正确答案:B
答案解析:有
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