Which of the following layers in the OSI Model is responsible for error detection and correction?

The Data Link Layer is responsible for error detection and correction in the OSI Model. It operates directly above the Physical Layer and is essential for ensuring reliable data transfer between adjacent nodes on a network. This layer adds headers and trailers to packet data, allowing it to frame the data properly.

Error detection mechanisms, such as checksums or cyclic redundancy checks (CRC), are employed to identify any inaccuracies or errors that may have occurred during transmission. In cases where errors are detected, the Data Link Layer can take corrective actions, such as requesting retransmission of corrupted frames, thereby ensuring that the data received is accurate and intact.

The other layers have different primary functions. The Application Layer focuses on providing network services directly to user applications, while the Transport Layer is primarily concerned with end-to-end communication, including flow control and ensuring complete data transfer. The Session Layer manages sessions and controls the dialogues between computers. None of these layers handle error detection and correction as a fundamental responsibility, which highlights the unique role of the Data Link Layer in maintaining data integrity during transmission.