A、二层设备依靠IGMP-slooping侦听IGMP消息，在二层维护组播地址转发表项
B、通过侦听IGMPQuery报文，IGMP-Snooping确定路由端口
C、通过侦听IGMPReport报文，IGMP-Snooping添加端口到已知组播组或者建立新的组播转发表项
更多“关于IGMP-Snooping工作原理，正确的是（）。”相关的问题
A、组播VLAN既节省了带宽，又减轻了三层设备的负担 B、需要将主机所属的VLAN配置为组播VLAN的子VLAN C、组播VLAN需要启用IGMP-Snooping功能 D、组播VLAN的子VLAN必须同时启用IGMP-Snooping功能
A、IGMP Snooping解决组播报文在三层广播的问题 B、IGMP Snooping运行在链路层，是二层以太网交换机上的组播约束机制，用于管理和控制组播组 C、IGMP Snooping通过在监听主机发出的IGMP报文，建立MAC组播地址表 D、IGMP Snooping不会消耗交换机的CPU
A、 组播不通 B、 组播正常，但IGMP Snooping 无法正确记录成员端口信息 C、 组播正常，IGMP Snooping 也可以正确记录组播成员端口信息 D、 如果同时启用IGMP Spoofing，可以使IGMP Snooping 正常工作
A、如果主机发出IGMP离开报文时，交换机将改主机加入到相应的组播表中 B、如果主机发出的IGMP主机报告报文时，交换机将删除与该主机对应的组播表项 C、二层交换机通过不断监听IGMP报文，交换机在二层建立和维护MAC广播地址表 D、没有运行IGMP Snooping时，组播报文将在二层广播，运行IGMP Snooping后，报文将不再二层广播，而是进行二层组播
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.
A、 IGMP snooping is not active for VLAN 120 because the IGMP feature has not been enabled on the switch with the feature igmp command. B、 The IGMP snooping querier for VLAN 120 is not in a running state because the Loopback interface configured with 1.1.1.1/32 is currently in a down state. C、 IGMP snooping has been disabled on the VLAN 120 SVI. D、 IGMP snooping has been disabled for VLAN 120 in VLAN configuration mode. E、 IGMP snooping is not active for VLAN 120 because VLAN 120 does not exist in the VLAN database.
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