The session layer of the OSI model is responsible for maintaining the communication flow between the two end devices. This includes assigning resources to incoming requests to connect to an application. To allocate resources adequately, idle timers disconnect sessions after a set time, releasing those resources for other requests. Note that although the OSI model assigns these duties to the session layer, many protocol stacks include the upper layers of the stack in the application. TCP/IP is such a protocol.
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