Osi Model Questions Medium
The Session layer is the fifth layer of the OSI Model and is responsible for establishing, managing, and terminating sessions between applications. It provides services that allow two communicating systems to establish, maintain, and synchronize their communication sessions.
The key features of the Session layer are as follows:
1. Session establishment and termination: The Session layer is responsible for setting up and tearing down sessions between applications. It handles the initial connection establishment and ensures that the session is properly terminated when the communication is complete.
2. Session management: This layer manages the ongoing communication session between applications. It controls the flow of data, handles synchronization, and manages checkpoints to ensure reliable and efficient communication.
3. Dialog control: The Session layer allows for full-duplex or half-duplex communication between applications. It manages the order of data exchange, allowing applications to take turns sending and receiving data.
4. Token management: In some cases, the Session layer uses tokens to control access to the communication channel. Only the system holding the token can transmit data, ensuring fair and orderly communication.
5. Session recovery: The Session layer provides mechanisms for recovering from communication failures or interruptions. It allows sessions to be resumed or reestablished in case of network disruptions or system failures.
6. Session synchronization: This layer ensures that the data exchanged between applications is properly synchronized. It manages the sequencing of data packets and handles any out-of-order or lost packets to maintain the integrity of the session.
Overall, the Session layer plays a crucial role in establishing and managing communication sessions between applications. It provides the necessary services to ensure reliable, orderly, and synchronized data exchange.