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This process of error detection, in which TCP retransmits and reorders packets after they arrive, can introduce latency in a TCP stream. The TCP layer then assembles the packets into a file and delivers the file to the receiving application.
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It then acknowledges those it receives and asks for the retransmission of any it does not, based on missing packet numbers. The TCP program layer in the client computer waits until all packets have arrived. Compare the different layers in the TCP/IP stack and the OSI model.Īlthough each packet in the transmission has the same source and destination IP address, packets may be sent along multiple routes. The TCP stack divides the file into data packets, numbers them and then forwards them individually to the IP layer for delivery. The HTTP program layer asks the TCP layer to set up the connection and send the file. When a web server sends an HTML file to a client, it uses the hypertext transfer protocol ( HTTP) to do so. In the Open Systems Interconnection ( OSI) communication model, TCP covers parts of Layer 4, the transport layer, and parts of Layer 5, the session layer.