When the TCP protocol communication, there is a connection (three-way handshake) , data exchange, releases the connection (four wave) .
Three grip: the image of the scene described a phone call
A (Client): Buddy, can hear it? Shane get in?
B (Server): I can hear hear, like you, can you hear it?
A (Client): listen, ah, I miss you.
Four play: image description
A (Client): I do not have data to send, you can disconnect the
B (Server): Well, you send the data I have been received
B (Server): I have no data can be sent, you can disconnect the
a (Client): well, then broke it
