How do IGMP versions interoperate?
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Correct answer: IGMPv2 is compatible only with IGMPv1..
Why this is the answer
IGMPv2 is backward compatible with IGMPv1. This means an IGMPv2 router can understand and process IGMPv1 messages from hosts, and IGMPv2 hosts can join groups managed by an IGMPv1 router. However, IGMPv2 introduces new message types (like Leave Group messages) that IGMPv1 does not understand. IGMPv3 is backward compatible with both IGMPv1 and IGMPv2, but it operates in a different mode (Source-Specific Multicast) that requires all devices to support v3 to fully utilize its features. Therefore, while IGMPv2 can interact with IGMPv1, it does not fully interoperate with IGMPv3 without losing v3's advanced capabilities.
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