Quiz: Error Detection
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- Question 1 of 9
An extra bit added to a string of binary code to ensure the number of 1-bits are either even or odd, depending upon the system used.
- Question 2 of 9
A block of data is sent alongside a calculated value. The receiving computer also calculates what it believes should be the value. The values are then compared to see if an error has occurred during transmission.
- Question 3 of 9
The final number in a code of numbers. It is calculated from all the other numbers in the code. It’s purpose is to spot errors on data entry.
- Question 4 of 9
A form of error detection that uses a system of acknowledgements and timeouts.
- Question 5 of 9
The receiving computer sends a copy of the data immediately back to the sending computer for comparison.
- Question 6 of 9
Sort these Parity Check steps into order:
- The sending and receiving computers agree the protocol to be used (even or odd)
- The sending computer adds the correct parity bit to the binary data (either an extra 1 or 0)
- The sending computer sends the binary data, including the parity bit
- The receiving computer checks to make sure the overall parity of the data received is as agreed (an even or odd number of 1 bits)
- If the parity of the data is incorrect, the receiving computer will request that the data is transmitted again
- Question 7 of 9
Sort these Checksum steps into order
- The sending computer uses the block of data to be sent, and a predefined mathematical algorithm, to calculate a checksum value
- The sending computer sends the data, plus the checksum value
- The receiving computer uses the data it receives to also calculate what it believes should be the checksum, using the same mathematical algorithm
- The two checksum values are compared by the receiving computer
- If the checksum values don’t match, the receiving computer requests that the data is transmitted again
- Question 8 of 9
Sort these Check Digit steps into order:
- The check digit is calculated and added to the barcode, packaging, product code etc at the point of manufacture
- A human types the long numerical code into a computer, e.g. the cashier will type the barcode number when a scanner fails or packaging is damaged
- The computer calculates what it believes should be the check digit, based on the numbers entered by the human
- The computer then compares it’s calculated check digit with the check digit typed in by the human (the last digit in the long code)
- If the two don’t match, then the human has made an error when typing in the numerical code, e.g. barcode number
- The human will be asked by the computer to re-enter the numerical code
- Question 9 of 9
Sort these steps for ARQ into order:
- The sending computer transmits a block of data
- The sending computer waits a period of time to see if the receiving computer acknowledges receipt of the data
- After a set period of time, a timeout occurs which triggers the data to be automatically resent by the sending computer
- This will continue until the receiving computer acknowledges the data has been received