Data communication
Real life
Where error detection saves you every day
You will meet error detection three times before you get home today
Quick check · tap an answer to continue
Lesson notes
Key points
- Mobile money transfer: Every MoMo packet carries a CRC so corrupted bits are caught and resent, not paid.
- Supermarket barcode scan: The last barcode digit is a check digit, so a misread scan beeps an error instead.
- Phone downloading an app: Downloaded files are verified against a checksum, so a damaged app refuses to install.
Takeaway: Redundant check bits catch errors everywhere data moves.
Quick check: What lets a barcode scanner reject a misread product code?
- A louder beep
- A check digit
- A brighter laser
The check digit is computed from the other digits, exposing misreads.
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