Session Layer in Computer Network | Layer 5 | OSI Model | TCP/IP Layer

Session Layer | Layer 5 | OSI Model | TCP/IP Layer

Session Layer (Layer 5)
The session layer permits two parties to hold ongoing communications called a session across a network. The applications on either end of the session can exchange data or send packets to another for as long as the session lasts. The session layer handles session setup, data or message exchanges, and tear down when the session ends. It also monitors session identification so only designated parties can participate and security services to control access to session information. A session can be used to allow a user to log into a remote time-sharing system or transfer a file between two machines.
The session layer has the option of providing one-or-two-way communication called dialogue control. Sessions can allow traffic to go in both directions at the same time, or in only one direction at a time. Token management may be used to prevent both sides from attempting the same operation at the same time. To manage these activities, the session layer provides tokens that can be exchanged. Only the side holding the token is permitted to perform the critical operation.
Another session service is synchronization. Consider the problems that occur when transferring a file between two machines and the system crashes not being able to complete the transfer. This process must be restarted from the beginning. To avoid this problem, the session layer provides a way to insert checkpoints into the data stream, so that after a crash, only the data after the last checkpoint has to be repeated.
The Session Layer is the 5th layer in the Open System Interconnection (OSI) model. This layer allows users on different machines to establish active communications sessions between them. It is responsible for establishing, maintaining, synchronizing, terminating sessions between end-user applications.

Session:
1) Authentication
2) Authorization
3) Session restoration
4) Flow control synchronization

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