What is the exact difference in between Unicast and
Multicast object ?
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Answer Posted / meera
A unicast packet is the complete opposite: one machine is
talking to only one other machine. All TCP connections are
unicast, since they can only have one destination host for
each source host. UDP packets are almost always unicast too,
though they can be sent to the broadcast address so that
they reach every single machine in some cases.
A multicast packet is from one machine to one or more. The
difference between a multicast packet and a broadcast packet
is that hosts receiving multicast packets can be on
different LANs, and that each multicast data-stream is only
transmitted between networks once, not once per machine on
the remote network. Rather than each machine connecting to a
video server, the multicast data is streamed per-network,
and multiple machines just listen-in on the multicast data
once it's on the network.
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