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Transmission Control Protocol (TCP) is one type of protocol that allows a collection of computers to communicate and exchange data on a network (network). TCP is a protocol that is at the transport layer (be it in the seven layers of the OSI reference model or the DARPA model) which is connection-oriented and reliable. TCP is used for applications that require data reliability.
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Connection-oriented: Before data can be transmitted between two hosts, two processes running at the application layer must negotiate to establish a connection session first. TCP connections are closed by using the TCP connection termination process. Full-duplex: For each TCP host, the connection that occurs between two hosts consists of two lines, namely the exit and the entry point. By using lower layer technology that supports full-duplex, data can be simultaneously received and sent. The TCP header contains the sequence number (TCP sequence number) of the data transmitted and an acknowledgment of the incoming data