error checking

Question 1

Parity check

Answer 1

checks a byte of data; a parity bit is added; counts number of 1s;

Question 2

Parity check can be _____ or ______.

Answer 2

odd, even

Question 3

If parity ______, error is detected.

Answer 3

incorrect

Question 4

When will parity not work?

Answer 4

two bits interchanged; multiple errors in same byte

Question 5

Automatic Repeat Request (ARQ)

Answer 5

Uses acknowledgement; check performed on receiving data;

Question 6

ARQ stands for

Answer 6

Automatic Repeat Request

Question 7

ARQ - send an acknowledgement that data is _______.

Answer 7

received

Question 8

ARQ - if acknowledgement not received in set time, data is ________.

Answer 8

resent

Question 9

Checksum

Answer 9

Value calculated form the data; added and transmitted with the data;

Question 10

Checksum - Value recalculated after __________.

Answer 10

transmission

Question 11

Checksum - Value ______ after transmission to check for ______.

Answer 11

compared, error

Question 12

Check digit

Answer 12

A digit calculated from the data; added to the data

Question 13

Check digit - Data _________ when data is resent

Answer 13

recalculated

Question 14

ARQ- if error detected, request sent to ______ data.

Answer 14

resend; resend request repeated until data sent correctly