The basic function of the transport layer is to accept data from the session layer, split it up into smaller units if need be, pass these to the network layer, and ensure that the pieces all arrive correctly at the other end. Furthermore, all this must be done efficiently, and in a way that isolates the upper layers from the inevitable changes in the hardware technology.
Transport Layer provides location and media independent end-to-end data transfer service to session and upper layers.
Functions of Transport Layer:
- Segmentation
- Segment size determination
- Sequencing
- Packet Type determination
- Flow Control
- Port Addressing
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