Computer ScienceCode 2210
Methods of error detection
What this topic asks you to be able to do
- Understand why data needs checking for errors once it has been transmitted, and the ways in which such errors can arise
- Describe the steps followed in each of these error detection methods, which find errors in data once it has been transmitted: parity check (odd and even), checksum and echo check
- Describe the way a check digit detects errors made during data entry, and identify situations in which check digits are used, including bar codes and international standard book numbers (ISBN)
- Describe the way an automatic repeat query (ARQ) is put to work to confirm data has arrived without error