What are three methods that may be use d to allow a switch to determine which ports to forward IP multicast messages to?（）
- A、IGMP
- B、IGMP snooping
- C、PIM
- D、CGMP
- E、static assignment
- F、CDP
正确答案:B,D,E
答案解析:有
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What are three methods that may be use d to allow a switch to determine which ports to forward IP multicast messages to?（）
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