Which data link layer operation ensures that frames are delivered without errors?

The operation that ensures frames are delivered without errors at the data link layer is error detection and correction. This involves mechanisms that check the integrity of transmitted data and take appropriate actions when issues are detected. Error detection typically uses techniques like checksums or cyclic redundancy checks (CRC) to identify whether errors occurred during transmission. If an error is detected, the system can either request the retransmission of the corrupted frame or use error correction methods to fix the errors directly, depending on the protocol in use.

This process is crucial because it maintains the reliability of the data link layer, ensuring that the data received at the destination is the same as that sent from the source. By implementing these strategies, the likelihood of undetected errors affecting the communication is significantly reduced, thus enhancing the reliability of data transmission across networks.