TCP is connection-oriented. A connection-oriented transport protocol establishes a connection between the source and destination. All of the segments belonging to a message are then sent over this virtual path. A connection-oriented transmission requires three phases: connection establishment, data transfer, and connection termination.
A is client, B is server.
1.Connection Establishment (SYN)(a.k.a. three-way handshake)
2.Data Transfer (using telnet demo)
3-1.Connection Termination (FIN)
In connection Termination : it takes four segments to terminate a connection since a FIN and an ACK are required in each direction.
3-2.Connection Termination (RST)
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