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OSI Transport Layer Concepts
The Transport layer, the next layer of the OSI model, can implement procedures to ensure the reliable delivery of messages to their destination devices. The term “reliable” does not mean that errors cannot occur; instead, it means that if errors occur, they are detected. If errors such as lost data are detected, the Transport layer either requests retransmission or notifies upper-layer protocols so that they can take corrective action.

The Transport layer enables upper-layer protocols to interface with the network but hides the complexities of network operation from them. Among its functions, the Transport layer breaks large messages into segments suitable for network delivery.

Further Information