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TCP/IP Guide by Charles M. Kozierok

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Simplex, Full-Duplex, and Half-Duplex Operation

Another aspect of performance that is worthy of some attention is the mode of operation of the network or connection. Obviously, whenever we connect together Device A and Device B, there must be some way for Device A to send to Device B and Device B to send to Device A. Many people don't realize, however, that networking technologies can differ in terms of how these two directions of communication are handled. Depending on how the network is set up and the characteristics of the technologies used, you may be able to improve performance through the selection of performance-enhancing modes.

Let's begin with a look at the three basic modes of operation that can exist for any network connection, communications ...

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