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<p>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 (typically <a href="page.php?w=network_switch">network switch</a>es and <a href="page.php?w=router_%28computing%29">router</a>s).  However, like the <a href="page.php?w=User_Datagram_Protocol">User Datagram Protocol</a>, multicast does not guarantee the delivery of a message stream.  Messages may be dropped, delivered multiple times, or delivered</p><p>
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