F. Session Layer Session layer is responsible for the two nodes in the network between the establishment and maintenance of communications. It defines how to start, control, and end a session, including the number of hours of control and management of two-way in order to complete only part of a continuous message can inform the application so that the data layer that is continuous, in a Some cases, If that layer all the data received, then the representative with the data layer. Session layer management session between the host process that is responsible for creating, managing, terminating the session between processes. Session Layer also used to insert check points in the data to achieve data synchronization.