Session Layer:
The session layer establishes, manages, and terminates user
connections. A session is an exchange of message between computers. It
synchronizes user task.
Synchronization involves the use of checkpoint in data stream. If a
failure occurs, only the data from the last checkpoint is retransmitted.
Suppose we want to send 500 pages of
data. Checkpoint can be used aster each 50 pages. if there is an error ate page
130, the pages from 101 will be retransmitted. Page from 1 to 100 will not be
retransmitted.
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