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Demonstrate the various error detection techniques at data link layer with example.

Data Link Layer Error Detection Techniques: A Deep Dive

Simple Parity Check

  • Adds a single bit (parity bit) to the data.
  • Even parity: parity bit makes total number of 1s even.
  • Odd parity: parity bit makes total number of 1s odd.
  • Example: Data "10110" Even parity adds "1" (total 3 ones).

Two-Dimensional Parity Check

  • Adds parity bits to rows and columns.
  • Detects and corrects single-bit errors.
  • Example: A matrix of data bits with parity bits for rows and a final parity bit for the column of row parity bits.

Checksum

  • Calculates a checksum value based on data.
  • Sender and receiver compute checksums; compare for errors.
  • Example: Adding all data words (considering overflow) and using the complement as checksum.

Cyclic Redundancy Check (CRC)

  • Uses polynomial division to generate a remainder (CRC).
  • Appends CRC to data. Receiver divides; zero remainder indicates no error.
  • Example: Dividing the data by a generator polynomial (e.g., CRC-32).

Longitudinal Redundancy Check (LRC)

  • Calculates a checksum for each line/row of data (character or byte).
  • A final checksum across all LRCs is calculated and transmitted.
  • Used for detecting errors across multiple data packets.
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