Which layer of the OSI model is called the Session Layer?

The Session Layer is identified as Layer 5 in the OSI model. This layer is crucial for managing sessions between applications. It is responsible for establishing, maintaining, and terminating connections between devices. Functions at this layer include managing dialog control, which dictates whether the communication is half-duplex (one direction at a time) or full-duplex (both directions simultaneously), and also ensuring that the sessions can recover from interruptions.

In contrast, other layers have different roles: the Transport Layer, which is Layer 4, focuses on data transport and error handling; Layer 6, known as the Presentation Layer, deals with data translation and formatting; and Layer 7, the Application Layer, provides end-user services and application services. Therefore, recognizing Layer 5 as the Session Layer is essential for understanding how applications communicate over a network and the management of those communication sessions.