In Data Link Control, which of the following is used for error correction?

Explanation

Backward error correction It also is known as Automatic Repeat ReQuest, ARQ. It uses feedback from the receiver to the transmitter: the receiver signals to the transmitter whether a block of data was received correctly or not. Backward Error Correction algorithms include: Parity bits, CRC (Cyclic Redundancy Check) & LRC (Longitudinal Redundancy Check) In Data Link Control, backward error correction is used for error correction. Parity check It is a simple way to add redundancy bits to the packets such that the total number of 1's is even (or odd). Single parity check: a single bit is appended to the end of each frame, the bit is 1 if the data portion of the frame has odd number of 1's. Otherwise, it is 0. Checksum This is a block code method where a checksum is created based on the data values in the data blocks to be transmitted using some algorithm and appended to the data. When the receiver gets this data, a new checksum is calculated and compared with the existing checksum. A non-match indicates an error. Cyclic redundancy check (CRC) It is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents.