After the TIME_WAIT state completes, all the resources allocated for this connection are released. After the four-way closure, the server will allow 4 minutes of time (default), during which any pending packets on the network are to be processed, this period is the TIME_WAIT state. The four-way closure where both sender and receiver agree on closing the session is termed as graceful closure. Establishing a TCP session would begin with a three-way handshake, followed by data transfer, and then a four-way closure. One of the ways in which TCP ensures reliability is through the handshake process.
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