Multicasting on networks that use switches and no routers is entirely dependent on IGMP .

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Multicasting on networks that use switches and no routers is entirely dependent on IGMP (Internet Group Management Protocol), which is used by devices to signal to the network that they want to receive a particular multicast stream. Switches use IGMP to identify which devices are members of a multicast group and forward the multicast traffic only to those devices, allowing efficient and optimized delivery of multicast traffic.

Multicasting on Networks That Use Switches and No Routers Is