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【多选题】
在组播网络环境中，如果IGMPV2主机和IGMPV1路由器（以下简称版本2主机和版本一路由器）共同处于同一个局域网当中，他们是如何协同工作的？（）A.
版本1路由器把IGMPV2报告看做是无效的IGMP信息类型并且忽略它
B.
当版本1路由器作为有效的IGMP查询器的时候，版本2的主机必须发送IGMPV1报告
C.
当版本2主机检测出IGMP查询器是版本1的路由器的时，它必须始终用IGMPV1报告作出响应。
D.
在版本2主机离开时，它仍然会发送IGMP离开消息。并且该消息不能被抑制
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