Question:easy

Which error detection method involves dividing the data by a predetermined divisor and appending the remainder?

Show Hint

Which technique uses modulo-2 polynomial division and attaches the remainder as check bits?
Updated On: Jul 2, 2026
  • Hamming Code
  • Parity Checking
  • Cyclic Redundancy Check
  • Checksum
Show Solution

The Correct Option is C

Solution and Explanation

Think about what "append the remainder" means. To get a remainder you must perform a division, so the method has to divide the data block by something fixed.

In CRC the sender picks a generator of degree $r$. The message is shifted left by $r$ bits and divided by the generator using modulo-2 arithmetic. The $r$-bit remainder is then attached to the data:

\[ \text{Transmitted frame} = \text{Data} \; || \; \text{Remainder} \]

The receiver divides the whole received frame by the same generator. A zero remainder means no detected error. This matches the question word for word.

Parity, checksum, and Hamming code never perform division by a divisor, so they are ruled out.

\[\boxed{\text{Cyclic Redundancy Check}}\]
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