How tcp establishes a connection

Method to establish a tcp connection: first create a transmission control block TCB; then create a transmission control block TCB and send a connection request segment to the server; then reply with a confirmation segment and enter the established connection state; When the confirmation message segment is finally received, the connection can be entered into the established connection state.

Three message handshake to establish TCP connection

• The server process is created first Transmission control block TCB and is in the listening state, waiting for the client's connection request

• The client creates the transmission control block TCB and sends a connection request segment to the server

• After the server receives the connection request segment, if it agrees to establish the connection, it sends a confirmation segment

• The client process receives the confirmation segment from the server After receiving the confirmation message segment, it immediately replies with a confirmation message segment and enters the established connection state

• After the server receives the confirmation message segment, it also enters the established connection state

Transmission Control Block TCB (Transmission Control Block) stores some important information in each connection

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