Session Layer in OSI Model

The Session Layer in OSI Model is the network dialog controller that establishes interaction between communicating systems. The layer also maintains and synchronizes the interactions.

Session Layer in OSI Model

The following are the roles of session layer in OSI Model,

Network Dialog Controller

The session layer allows communication between two processes. It establish, maintains and synchronizes the interaction. The communication occurs in edither half-duplex or full-duplex.


The Layer adds checkpoints into a stream of data. Let us see an example. If you have a file of 1000 pages. Add checkpoints at every 100 pages.

If now let us say an error occurs at page 720, then 1-700 pages need not to be transmitted. Only the pages from 700-800 need to be taken care of and restransmitted.

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Transport Layer in OSI Model
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