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In network programming, a server program is designed to handle requests from clients and provide appropriate responses. One of the fundamental mechanisms to ensure reliable communication between a client and a server is the use of acknowledgements (ACK). When a client sends a message to the server, the server processes the incoming data and sends back an acknowledgement to confirm that the message has been successfully received. This mechanism is essential in both connection-oriented and connectionless communication models, though _____ ______ ___ _________ _____ ________ ______ _________.
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