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Multicast is a network addressing method 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 on the IP routing level, where routers create optimal distribution paths for datagrams sent to a multicast destination address spanning tree in real-time. "Multicast" is also used to describe data link layer one-to-many distribution such as Ethernet multicast addressing, ATM point-to-multipoint VCs or Infiniband multicast. This article is about the abstract concept of multicast and its independent implementations. Key concepts in IP Multicast include an IP Multicast group address, a multicast distribution tree and receiver driven tree creation.
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