At which OSI layer does error correction typically occur?

The correct answer is the Data Link Layer. This layer is responsible for facilitating reliable communication between two directly connected nodes. It provides error detection and correction mechanisms to ensure data integrity as it travels over a physical medium. The Data Link Layer makes use of protocols that can identify and correct any errors that may have occurred during transmission.

The approach includes techniques such as checksums, cyclic redundancy checks (CRC), and automatic repeat requests (ARQ), which help in detecting and correcting errors. When a data frame is received, the Data Link Layer checks for errors, and if any are found, it can request a retransmission of the data.

Understanding this layer’s role in error correction is essential for ensuring that messages are sent and received correctly across networks, making the Data Link Layer a critical component of network communication.