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