Multicast : Why Use it
When multiple receivers are required to get the same data at approximately the same time, multicast is a more efficient way of delivering data than unicast. A unicast packet has a single source IP address and a single destination IP address. A multicast packet has a single source IP, but it has a multicast destination IP address that will be delivered to a group of receivers.
Click here to View the advantages of multicast over unicast delivery.

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