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CISSP All-in-One Exam Guide, Eighth Edition, 8th Edition by Fernando Maymi, Shon Harris

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Transmission Methods

A packet may need to be sent to only one workstation, to a set of workstations, or to all workstations on a particular subnet. If a packet needs to go from the source computer to one particular system, a unicast transmission method is used. If the packet needs to go to a specific group of systems, the sending system uses the multicast method. If a system wants all computers on its subnet to receive a message, it will use the broadcast method.

Unicast is pretty simple because it has a source address and a destination address. The data goes from point A to Z, it is a one-to-one transmission, and everyone is happy. Multicast is a bit different in that it is a one-to-many transmission. Multicasting enables one computer to send ...

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