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TCP is a window-based flow and congestion control protocol that uses a sliding window mechanism to manage its data transmission. The purpose of this scheme is to guarantee that the sender adjusts its transmission rate to meet both sender and receiver needs. Thus, the TCP sender contains a variable denoted window determining the amount of packets it can send into the network before receiving an ACK. This variable changes dynamically over time to properly limit the connection's sending rate. The sending rate of a TCP connection is regulated by two distinct mechanisms, the flow control and the congestion control.
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