Among the listed choices, checksum coding is the method intended to provide stronger error detection, including many multi-bit error patterns. A simple parity bit reliably detects an odd number of bit errors but can miss two-bit errors because parity may remain unchanged.
Formula / Key Relation
Parity: detects any odd number of bit flips; not guaranteed for an even number.
Checksum: compare transmitted and recomputed check value.
Detailed Explanation
Concept & ReasoningError-detecting schemes differ in capability. Single parity adds only one redundant bit; flipping two bits can preserve the original parity, so double-error detection is not guaranteed. A checksum combines blocks of data and compares a computed check value at the receiver, giving broader error-detection capability than simple parity in the context of the given options.How to Solve It in the ExamIf the question contrasts parity with checksum for multiple errors, parity is the weaker choice.Important Exam PointDistinguish 'can detect some double errors' from 'guarantees detection of every double error'; the wording of coding questions matters.Related Revision PathThis question…
Concept & Reasoning
Error-detecting schemes differ in capability. Single parity adds only one redundant bit; flipping two bits can preserve the original parity, so double-error detection is not guaranteed. A checksum combines blocks of data and compares a computed check value at the receiver, giving broader error-detection capability than simple parity in the context of the given options.
How to Solve It in the Exam
If the question contrasts parity with checksum for multiple errors, parity is the weaker choice.
Important Exam Point
Distinguish 'can detect some double errors' from 'guarantees detection of every double error'; the wording of coding questions matters.
Related Revision Path
This question sits in the revision path Digital Electronics → Digital Codes → Error Detection .
Quick Trick
If the question contrasts parity with checksum for multiple errors, parity is the weaker choice.
Common Mistake
Assuming a parity bit detects every two-bit error.
Exam Tip
Distinguish 'can detect some double errors' from 'guarantees detection of every double error'; the wording of coding questions matters.
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