What is the main function of the Transport Layer in the OSI model?

The main function of the Transport Layer in the OSI model is to manage the transmission of data between systems, which includes ensuring reliable communication through connection management and error recovery processes. This layer is responsible for segmenting data from the upper layers and then reassembling it at the destination. By doing so, it allows for efficient data transfer and ensures that data packets reach their destination without loss or corruption.

Connection management involves establishing, maintaining, and terminating connections between devices, which is critical for effective data exchange. Additionally, the Transport Layer implements error recovery techniques to detect and retransmit lost or corrupted packets, which enhances the reliability of communication. This functionality is essential for applications that require high levels of data integrity and performance, such as file transfers and real-time communications.

In contrast, other layers of the OSI model serve different functions: data representation and formatting relate to the Presentation Layer, while physical addressing and switching are responsibilities of the Data Link and Physical Layers. Session management and control are handled at the Session Layer, focusing on managing sessions between applications, further illustrating the distinctive roles each layer plays in the OSI model.