transport layer

(redirected from OSI layer 4)

transport layer

(networking)
(Or "host-host layer") The middle layer in the OSI seven layer model. The transport layer determines how to use the network layer to provide a virtual error-free, point to point connection so that host A can send messages to host B and they will arrive un-corrupted and in the correct order. It establishes and dissolves connections between hosts. It is used by the session layer.

An example transport layer protocol is Transmission Control Protocol (TCP).

OSI documents: ITU Rec. X.214 (ISO 8072), ITU Rec. X.224 (ISO 8073).
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transport layer

The processing in a network protocol that provides end-to-end management. The transport layer is layer 4 of 7 in the OSI model, and it may or may not guarantee error-free delivery depending on the specific protocol used. See transport protocol, TCP/IP and OSI model.
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