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BCMSN Exam Cram™ 2 (Exam Cram 642-811) by Richard A. Deal

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One of the issues that must be dealt with in multicasting is the discovery of the end stations that will be participating in a multicast group. Preferably, you want the end stations to advertise the fact that they will be participating and have your RPs and switches use this information to intelligently forward multicast traffic from the multicast server to the end stations. Without this type of information, the network would have to flood the traffic to every segment.

The solution provided for IP networks is called the Internet Group Management Protocol (IGMP), which works between end stations and RPs. End stations send out advertisements to the RPs, denoting which multicast application (or applications) they're participating ...

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