Which layer of the OSI model is responsible for end-to-end communication?

The layer of the OSI model responsible for end-to-end communication is the Transport layer. This layer is crucial because it ensures that data is transferred reliably and in order from the sender to the receiver. It manages the segmentation of data, flow control, and error correction, providing a set of communication services for applications. By handling these aspects, the Transport layer enables applications on different devices to communicate effectively, facilitating error detection and recovery, as well as providing the necessary data integrity.

Other layers, such as the Application layer, focus on end-user services; the Session layer manages sessions and connections between applications; while the Network layer is responsible for routing and forwarding data packets between devices across different networks. Each layer has distinct functions that contribute to overall network communication, but the Transport layer specifically deals with the reliability and correctness of the data being sent and received, which is integral to end-to-end communication.