Which term describes the method of detecting errors in data transmission using checks such as parity and CRC?

• A. Error checking
• B. Error codes
• C. Dynamic DNS (DDNS)
• D. Dumpster diving

Answer: (A)

Error detection in data transmission relies on adding extra information so the receiver can verify that the data arrived intact. Parity bits provide a simple check by indicating whether the number of 1s in a block is even or odd, helping catch single-bit flips. CRC, or cyclic redundancy check, uses polynomial calculations to produce a checksum that can detect a wide range of errors in larger data blocks. This collection of techniques is called error checking (error-detection) because its purpose is to detect, not correct, errors that may have occurred during transmission. The other terms don’t fit: Dynamic DNS is about updating domain-to-IP mappings, dumpster diving refers to stealing information from discarded materials, and error codes are status indicators in communications that report problems rather than methods for detecting payload errors.