Multicast and Broadcast

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Hi All,
1)Define Multicast and Broadcast?
2)where can i use multicast and broadcast?
3)difference between multi-cast and broad-cast?

Pls any one can help me..............

Regards,
Ranjith

Posted 16-Jan-13 22:21pm

ranjithkumar81

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Pascal-78 · Accepted Answer · 2013-01-16T23:44:00

BroadCast: send data to any other network adapters on the same network (using the same network mask) using only 1 emitted frame.
MultiCast: send data to a subset of network adapters on a network using only 1 emitted frame.

BroadCast used address like 192.168.1.255 to broadcast a message to any address from 192.168.1.0 to 192.168.1.254 where the network mask is 255.255.255.0.
MultiCast used address like 224.1.2.3 to send a message to all adapter attached to this group address 224.1.2.3. To receive data from a multicast, the client must register itself to the address group (224.1.2.3 even if its IP address is 192.168.1.1)

Multicast need to have IGMP (Internet Group Management Protocol) compatible switch to route data only to the correct clients, without IGMP it will act as broadcast and send the data to all its ports.

Multicast with good network infrastructure can reduce data trafic when data need to be sent to a lot a client but not every where.

Make a simple research with google or any other tool, and I'm sure you will find a lot of information on multicast.