by 
Oddjob
ANSWERS: 2
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Multicast is the delivery of data (IP Packets) to multiple destinations simultaneously. Broadcast is where the packets are delivered to every destination (like in a LAN). The challenge is to deliver the packets using the least amount of network resources. You don't want to send a packet 10 times to reach 10 sources and use 10x the bandwidth. You would want to optimize it so that a packet is only sent once on each link required to reach all the destinations.
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Multicast addressing is a network technology for the delivery of information to a group of destinations simultaneously using the most efficient strategy to deliver the messages over each link of the network only once, creating copies only when the links to the multiple destinations split. The word "multicast" is typically used to refer to IP multicast which is often employed for streaming media and Internet television applications. In IP multicast the implementation of the multicast concept occurs at the IP routing level, where routers create optimal distribution paths for datagrams sent to a multicast destination address spanning tree in real-time. At the Data Link Layer, multicast describes one-to-many distribution such as Ethernet multicast addressing, Asynchronous Transfer Mode (ATM) point-to-multipoint virtual circuits or Infiniband multicast.
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