CompTIA Network+ Practice Test

Which layer is responsible for the control of sessions between devices?

1. Network layer

2. Data Link layer

3. Transport layer

4. Session layer

The correct answer is: Session layer

The session layer is responsible for establishing, managing, and terminating sessions between applications on different devices. It provides a mechanism for opening a connection, allowing for data exchange, and then closing the connection when the communication is complete. This layer ensures that the session is maintained consistently, coordinating communication between devices in an orderly manner to prevent data loss and maintain synchronization. Functions performed by the session layer include session establishment, maintenance, and termination. It may also provide dialog control, enabling devices to communicate in either half-duplex or full-duplex modes. By handling these responsibilities, the session layer plays a critical role in the effective operation of network communication, making it easier for higher-level protocols to manage data transfer. Other layers, such as the network layer, data link layer, and transport layer, focus on different aspects of networking. The network layer is primarily concerned with path determination and logical addressing, the data link layer manages node-to-node data transfer and error detection/correction, while the transport layer ensures reliable data transfer through segmentation and flow control. Each layer serves its distinct functions, but the session layer specifically addresses the management of sessions between devices, reinforcing its importance in the networking model.