Session Layer
It deals with the concept of Sessions. When a user logins to a remote server he should be authenticated before getting access to the files and application programs. A further job of session layer is to set up and maintain sessions. If throughout the transfer of data between two machines the session breaks down, then it is the session layer which re-establishes the connection. It also ensures that the data transfer should be starts from where it breaks keeping it transparent to the end user. For instance, In case of a session with a database server, this layer introduces check points at various places so that in case the connection is wrecked and re-established, the transition going on the database is not gone even if the user has not committed. This action is called Synchronization. One more function of this layer is Dialogue Control which determines whose turn is it to speak in a session. It is very useful in video conferencing.
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