<P> An example of a session - layer protocol is the OSI protocol suite session - layer protocol, also known as X. 225 or ISO 8327 . In case of a connection loss this protocol may try to recover the connection . If a connection is not used for a long period, the session - layer protocol may close it and re-open it . It provides for either full duplex or half - duplex operation and provides synchronization points in the stream of exchanged messages . </P> <P> Other examples of session layer implementations include Zone Information Protocol (ZIP)--the AppleTalk protocol that coordinates the name binding process, and Session Control Protocol (SCP)--the DECnet Phase IV session - layer protocol . </P> <P> Within the service layering semantics of the OSI network architecture, the session layer responds to service requests from the presentation layer and issues service requests to the transport layer . </P> <Ul> <Li> Authentication </Li> <Li> Authorization </Li> <Li> Session restoration (checkpointing and recovery) </Li> </Ul>

What is the difference between session and transport layer
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