State the difference between data verification and data validation.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

1. [1] data verification is checking if input data is the same as the original whereas data validation is checking that the data is reasonable / sensible
2. [1] checksum value is calculated from the data before transmission // correct description of a checksum algorithm
3. [1] this calculated value is transmitted with the data
4. [1] receiving computer recalculates the checksum from the received data
5. [1] if the checksum received and calculated match, no error has occurred // if the checksum received and calculated do not match, an error has occurred
6. [1] to make sure data is in the required format // only expected characters allowed
7. [1] to make sure the data is already present in the system
8. [1] to make sure the data contains the correct number of characters
9. [1] to ensure that non-numeric data is entered