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Session layer is the fifth layer in the OSI reference model, which allows communicating systems to establish and manage sessions between them. In general a session is a lengthy time duration logical link between two applications processes to exchange information.

Description

Following are the functions and responsibilities of session layer :

• Allows communication between local and remote application process in either half duplex or full duplex transmission mode.
• It sets up, manages and terminates the connection between two application processes.
• Synchronizes the communication by adding checkpoints into a stream of data.
• Informs errors of upper layer to the user.

Protocols used: NetBIOS, RPC.

Devices used: Gateway.