seSSion Layer

它涉及seSSions.When a user logins to a remote server he should be身份验证在访问文件和应用程序之前。会话层的进一步工作是设置和维护会话。如果在两台机器之间的数据传输过程中，会话分解，则是会话层重新建立连接。它还可以确保应开始数据传输的位置，从而使其与最终用户保持透明。例如，如果与数据库服务器进行会话，则该层介绍check pointsat 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同步。该层的另一个功能是Dialogue Controlwhich determines whose turn is it to speak in a session. It is very useful in video conferencing.

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