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Network Programming for Microsoft® Windows®, Second Edition by Jim Ohlund, Anthony Jones

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Connectionless Communication

Connectionless communication behaves differently than connection-oriented communication, so the method for sending and receiving data is substantially different. First we’ll discuss the receiver (or server, if you prefer) because the connectionless receiver requires little change when compared with the connection-oriented servers. After that we’ll look at the sender.

In IP, connectionless communication is accomplished through UDP/IP. UDP doesn’t guarantee reliable data transmission and is capable of sending data to multiple destinations and receiving it from multiple sources. For example, if a client sends data to a server, the data is transmitted immediately regardless of whether the server is ready to receive it. ...

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