TCP Connection Establishment Process: The "Three-Way Handshake"
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We have discussed in earlier topics in this section the connection orientation of TCP and its operation. Before TCP can be employed for any actually useful purposethat is, sending dataa connection must be set up between the two devices that wish to communicate. This process, usually called connection establishment, involves an exchange of messages that transitions both devices from their initial connection state (CLOSED) to the normal operating state (ESTABLISHED).
The connection establishment process actually accomplishes several things as it creates a connection suitable for data exchange:
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