Consider 𝐼𝑆𝑂−𝑂𝑆𝐼 network architecture reference model. Session layer of…

Correct answer: synchronization (note spelling).

Session layer services include:

• Dialog control — manages who communicates and when (full-duplex, half-duplex, and dialog establishment/termination).

• Token management — controls access tokens to prevent collisions when multiple parties share a session.

• Synchronization — insertion of synchronization points (checkpoints) into a data exchange so long transactions can be resumed from the last checkpoint after an interruption.

Why the other choices are incorrect:

• Flow control is a transport-layer function (for example, TCP sliding window), not a session-layer service.

• Error detection and correction are handled primarily by the data link and transport layers; the session layer does not perform low-level error correction.

• The term spelled as "asyncronization" is incorrect and misleading; the intended and correct service is synchronization.