Error detection at the data link layer is achieved by.

Correct Answer: Cyclic Redundancy Code (CRC) Explanation (English): Cyclic Redundancy Check (CRC) is the common method used at the data link layer to detect errors in transmitted frames. How it works: The frame's bits are treated as coefficients of a polynomial. The sender divides this polynomial by a predetermined generator polynomial and appends the remainder (CRC) to the frame. The receiver performs the same division and compares remainders to detect errors.