Consider ISO-OSI network architecture reference model. Session layer of this model offer Dialog control, token management and ______ as services.

In ISO-OSI architecture, there are seven layers in this model. Starting from physical layer (layer 1), then data link layer, network layer, transport layer, session layer, presentation layer, application layer (layer - 7) respectively.

In this layer our main focus is on work of session layer.

Session layer:

Session layer is the network dialog controller. It establishes, maintains and synchronizes the interaction among communicating system. It is responsible for dialog control, token management and synchronization in the network.

• Dialog control: Session layer allows two systems to enter into a dialog. It allows the communication between two processes to take place in either half-duplex or full – duplex.
• Synchronization: It allows a process to add checkpoints to a stream of data.
• Token management: It prevents two parties from attempting the same critical operation at the same time