TheTransport layer(Layer 4 of the OSI model) includes theTransmission Control Protocol (TCP), which provides reliable, connection-oriented communication. TCP ensures error-checking, sequencing, and retransmission of lost packets.
Application layerdeals with end-user protocols like HTTP and FTP.
Session layermanages communication sessions but not transport protocols.
Network layerfocuses on IP addressing and routing, not transport mechanisms.
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