I Hope you know what Broadcast is, if not Click Here
Unicast: (One to One)
This is simple like we know to whom we have to talk, so we just go and talk.
Computer knows the destination IP address, so it transfers the data directly to the concern computer.
Multicast: (One to Many)
To understand in a simple way, we forward a text message to our friends list, which means at a single transmission the text message has been sent to the persons only in our friends list.
Example: A Computer sends data to all the computers in a particular group only, the Computers out from that group won’t receive the data.
Class D IP is used for multicasting. Multicasting is much used between routers to make relation with each other.
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