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Why is CRC preferred over simple parity or checksum for error detection in modern networks?

hard📝 Conceptual Q10 of 15
Computer Networks - Physical and Data Link Layer
Why is CRC preferred over simple parity or checksum for error detection in modern networks?
ACRC detects more types of errors including burst errors
BCRC uses fewer bits than parity
CCRC is easier to calculate manually
DCRC does not require polynomial division
Step-by-Step Solution
Solution:

  1. Step 1: Compare error detection capabilities

    CRC can detect many error types including burst errors, which parity and checksum often miss.

  2. Step 2: Identify why CRC is preferred

    Because of its strong error detection, CRC is preferred despite being more complex to compute.

  3. Final Answer:

    CRC detects more types of errors including burst errors -> Option A

  4. Quick Check:

    CRC detects burst errors better than parity/checksum [OK]
Quick Trick: CRC catches burst errors better than others [OK]
Common Mistakes:
MISTAKES
  • Thinking CRC uses fewer bits
  • Believing CRC is simpler to calculate
  • Ignoring polynomial division in CRC

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