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Module 1: Physical Layer & Data Communication

20172m

Write any two functions of the session layer in OSI model.

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Answer

Any two important functions of the Session Layer are:

  1. Dialog control: It manages the dialogue between two communicating applications, including controlling which side can transmit at a particular time. It can support half-duplex and full-duplex communication.

  2. Synchronization/checkpointing: The Session layer can insert synchronization points (checkpoints) into a long data transfer. If communication is interrupted, the transfer can resume from a checkpoint instead of restarting from the beginning.

Other valid functions

The Session layer is also associated with session establishment, session management, and session termination between applications.

Exam-ready answer

The Session layer establishes, manages, and terminates communication sessions between applications. Two functions are dialog control and synchronization/checkpointing.

For 2 marks: Write any two functions with one-line explanations.

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