KwickClips Networks and the Internet · 39 sec · free
What is an acknowledgement?
Short answer. A short message from the receiver saying the data arrived without errors.
Where are check digits used?
In numbers such as an ISBN or a product barcode.
Two methods
| Method | Idea |
|---|---|
| ARQ | Resend |
| Check digit | Typing errors |
Remember
| ISBNs use check digits |
The sender hears nothing back. What should it do? Two methods. ARQ resends if no acknowledgement arrives in time. A check digit catches typing errors in numbers. Remember. ISBNs and barcodes use check digits.
This clip is from the full lesson: Error Detection: Parity, Checksum, Echo Check and ARQ — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478)
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