6.2 Data integrity Flashcards
Data integrity
the accuracy, completeness and consistency of data
Validation
method used to ensure entered data is reasonable and meets certain input criteria
Verification
method used to ensure data is correct by using double entry or visual checks
Check digit
additional digit appended to a number to check if entered data is error free
Modulo-11
method used to calculate a check digit based on modulus division by 11
Checksum
verification method used to check if data transferred has been altered or corrupted, calculated from the block of data to be sent
Parity check
method used to check data has been transferred correctly that uses even or odd parity
Parity bit
an extra bit found at the end of a byte that is set to 1 if the parity of the byte needs to change to agree with sender or receiver protocol
Odd parity
binary number with an odd number of 1-bits
Even parity
binary number with an even number of 1-bits
Parity block
horizontal and vertical parity check on a block of data being transferred
Parity byte
additional byte sent with transmitted data to enable vertical parity checking (as well as horizontal parity checking) to be carried out
Automatic repeat request (ARQ)
a type of verification check
Acknowledgement
message sent to a receiver to indicate that data has been received without error
Timeout
time allowed to elapse before an acknowledgement is received