Session Layer Explained | Layer-5 | Session Layer diagram

Session Layer:

Ø  Session layer in OSI reference model is responsible for establishing, maintaining and terminating the sessions.
Ø  Session Layer  is also called as Layer 5.

Ø  It deals with sessions or interactions between the applications(Live example of Phone call)

Ø  Session ID is used to identify a session or interaction.

Ø  Ex: RPC,SQL,NFS

Specific Responsibilities of Session Layer in Computer Network:

Ø  Dialog control: The session layer allows two systems to enter into a dialog. It allows the communication between two processes to take place in either half-duplex (one way at a time) or full-duplex (two ways at a time) mode.

Ø  Synchronization: The session layer allows a process to add checkpoints, or synchronization points, to a stream of data. For example, if a system is sending a file of 2000 pages, it is advisable to insert checkpoints after every 100 pages to ensure that each 100-page unit is received and acknowledged independently.