What is data integrity, and what is a checksum used for?

What is data integrity, and what is a checksum used for?

• A. Data integrity ensures data remains accurate and uncorrupted; a checksum detects errors by verifying data contents.
• B. Data integrity is about securing data with encryption; checksums prevent errors.
• C. Data integrity is about backing up data; a checksum speeds up I/O.
• D. Data integrity refers to data format standardization; a checksum compresses data.

Answer: (A)

Data integrity means ensuring data stays accurate and unaltered from its original state, whether it’s being stored or transmitted. A checksum is a small value derived from the data using a simple algorithm, and it’s used to verify integrity by recalculating the checksum after the data is read or received and comparing it to the original. If the checksums match, the data likely hasn’t changed; if they don’t, something corrupted the data during storage or transfer. This helps catch accidental errors, not encryption or backups, and it isn’t about speeding up input/output or compressing data.

Data integrity means ensuring data stays accurate and unaltered from its original state, whether it’s being stored or transmitted. A checksum is a small value derived from the data using a simple algorithm, and it’s used to verify integrity by recalculating the checksum after the data is read or received and comparing it to the original. If the checksums match, the data likely hasn’t changed; if they don’t, something corrupted the data during storage or transfer. This helps catch accidental errors, not encryption or backups, and it isn’t about speeding up input/output or compressing data.