? ?A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port{{U}} ?(71) ?{{/U}} to accomplish this. Another responsibility of a transport layer protocol is to create a {{U}}?(72) ?{{/U}} and error-control mechanism at the transport level. TCP uses a sliding {{U}}?(73) ?{{/U}} protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve {{U}}?(74) ?{{/U}} control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends {{U}}?(75) ?{{/U}} of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

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