Which layer is primarily responsible for establishing, maintaining, and terminating connections between applications?

Which layer is primarily responsible for establishing, maintaining, and terminating connections between applications?

• A. Session Layer
• B. Transport Layer
• C. Application Layer
• D. Presentation Layer

Answer: (A)

Establishing, maintaining, and terminating a dialogue between two applications is the job of the Session Layer. This layer sits above the Transport Layer and manages the conversation itself—setting up a session, keeping it open during data exchange, coordinating who talks when, and closing the session when finished. It can also insert synchronization points so both ends stay in sync if a pause occurs. The Transport Layer handles the actual transfer of data, end-to-end reliability, and sequencing, but not the control of the application-level conversation. The Application Layer provides user-facing services, while the Presentation Layer handles data formatting and encryption. So, the Session Layer is the one responsible for these application-level connections.

Establishing, maintaining, and terminating a dialogue between two applications is the job of the Session Layer. This layer sits above the Transport Layer and manages the conversation itself—setting up a session, keeping it open during data exchange, coordinating who talks when, and closing the session when finished. It can also insert synchronization points so both ends stay in sync if a pause occurs. The Transport Layer handles the actual transfer of data, end-to-end reliability, and sequencing, but not the control of the application-level conversation. The Application Layer provides user-facing services, while the Presentation Layer handles data formatting and encryption. So, the Session Layer is the one responsible for these application-level connections.