Which layer of the OSI model is focused on end-to-end communication?

The Transport Layer is critical for end-to-end communication within the OSI model because it is responsible for establishing, maintaining, and terminating connections between devices across a network. This layer ensures that data is delivered accurately and in the correct sequence, providing reliable communication services. It handles segmentation and reassembly of data, flow control, and error correction, which are essential for maintaining the integrity of the communication process.

In addition, the Transport Layer is equipped with protocols like TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). TCP, for instance, guarantees reliable delivery of data, establishes a connection, and tracks the data packets sent and received. As a result, this layer plays an essential role in facilitating communication between different applications and services running on diverse devices, ensuring that data moves seamlessly from the source to the destination.