Which OSI layer manages sessions and is associated with APIs and RPCs?

• A. Presentation
• B. Data Link
• C. Session
• D. Physical

Answer: (C)

The session layer is responsible for managing conversations between applications, coordinating dialogue, and controlling how the two ends interact over a connection. It handles opening, closing, and maintaining a session, along with synchronization and dialog control so both sides stay in sync during communication. APIs and RPCs rely on this session context to establish and preserve a communication channel, track the sequence of interactions, and recover if a disruption occurs, often using a session identifier to tie related messages together. This focus on dialogue management and coordinated exchanges is what makes the session layer the best fit for describing session management and its association with APIs and RPCs. The other layers deal with different concerns: the presentation layer handles data representation and encryption, the data link layer manages framing and node-to-node transfer over a link, and the physical layer concerns the actual electrical/optical signaling.