Error checking methods

A form of error detection that uses a system of acknowledgements and timeouts.

• Echo check

• checksum

• check digit

• Automatic repeat request

A block of data is sent alongside a calculated value. The receiving computer also calculates what it believes should be the value.

• Check digit

• checksum

• Echo check

• parity check

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.

• Parity check

• echo check

• checksum

• check digit

When data is sent to a device, the data is sent back by the receiver to the sender to check if any errors occurred during transmission.

• parity check

• echo check

• ARR

• Chechsum

what is the parity bit of 0101011, if even parity is used?

• 0

• 1

For checksum method, if the sum of all the bytes in the transmitted block of data is __________ then the check sum is the sum itself

• <=255

• =255

• >256