Which layer of the OSI model is responsible for error detection and correction?

The Data Link layer is responsible for error detection and correction within the OSI model. This layer plays a crucial role in ensuring that data is transferred accurately across the physical medium. Each data frame transmitted is equipped with error-checking mechanisms, such as checksums or cyclic redundancy checks (CRC), to identify any corruption that may have occurred during transmission. If errors are detected, the Data Link layer can initiate correction measures, such as requesting the retransmission of data, thereby maintaining the integrity of the communication.

In contrast, the other layers of the OSI model do not primarily focus on error detection and correction. The Application layer deals with high-level protocols for end-user services and data representation. The Transport layer is more focused on end-to-end communication and session management, ensuring complete data transfer rather than the integrity of individual frames. The Session layer manages sessions between applications but does not include mechanisms for error correction in the data being transmitted. Thus, while all layers contribute to the overall communication process, the Data Link layer specifically addresses the important task of error detection and correction.