Which OSI layer is associated with segments and end-to-end communication?

• A. Physical layer
• B. Data Link layer
• C. Transport layer
• D. Application layer

Answer: (C)

The transport layer handles end-to-end communication between processes on different hosts and is responsible for breaking the data into segments for reliable delivery. This layer uses segmentation to divide data from a sending application and reassemble it at the destination, while also providing services like reliable delivery, flow control, and port-based multiplexing (distinguishing different applications). In this layer, protocols like TCP (reliable, connection-oriented) and UDP (unreliable, connectionless) operate, illustrating how end-to-end communication and data segmentation are handled. Other layers focus on different tasks: the data link layer deals with frames on a single link, the network layer handles routing and addressing between hosts, and the application layer deals with user-facing services. Therefore, the transport layer is the one associated with segments and end-to-end communication.