A "checkpoint" or synchronization point in a session is used to:

What is a checkpoint in networking?

• A checkpoint is a marker or reference point in a communication session.


• It records the progress of the data transfer between two devices.


• If the session fails or is interrupted, the data transfer can resume from the last checkpoint instead of starting over.

Why checkpoints are important:

• They prevent the need to resend all data from the beginning if an error occurs.


• They make communication more efficient, especially in long or large data transfers.


• They help in maintaining a reliable session between sender and receiver.

Example: Imagine you are downloading a large file. If a failure happens in the middle, checkpoints allow the download to resume from the last saved point instead of starting over.

Key functions of Session Layer related to checkpoints:

• Creates and manages sessions between devices.


• Places checkpoints during data transfer.


• Supports error recovery and synchronization.

Conclusion: The correct answer is "Save the state of communication". Checkpoints in the Session Layer help resume communication after failures, making networking more reliable and efficient.