Architecture
A network designed to deliver a multicast service using IGMP might use this basic architecture:
IGMP operates between the client computer and a local multicast router. Switches featuring IGMP snooping derive useful information by observing these IGMP transactions. Protocol Independent Multicast (PIM) is then used between the local and remote multicast routers, to direct multicast traffic from the multicast server to many multicast clients.
IGMP operates above the network layer, though it does not actually act as a transport protocol.
Read more about this topic: Internet Group Management Protocol
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