Session layer protocols establish and manage communication sessions from "summary" of Data Communications and Networking by Behrouz A. Forouzan
The Session layer is responsible for establishing, maintaining, and terminating communication sessions between two devices. These sessions allow for the exchange of data between the devices in an organized and structured manner. The Session layer protocols are used to manage these sessions efficiently and ensure that the data is transmitted accurately and in the correct sequence. When two devices need to communicate with each other, they must establish a session first. This process involves setting up parameters for the communication session, such as the type of communication, the format of the data, and the rules for error checking. Once the session is established, the devices can exchange data according to the agreed-upon parameters. During the communication session, the Session layer protocols monitor the connection to ensure that data is being transmitted properly. If any errors occur during the transmission, the protocols can request retransmission of the data or take other corrective actions to ensure that the communication session remains reliable. At the end of the communication session, the Session layer protocols are responsible for terminating the session in an orderly fashion. This involves closing the connection between the devices and releasing any resources that were allocated for the session. By properly managing the sessions, the Session layer protocols help to ensure that data is transmitted accurately and efficiently between devices.
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