Negative Acknowledgment (NACK)
Definition
A NACK reports a failed transmission or processing.
A protocol message indicating that data or an operation was not correctly received or executed.
Simply explained
The receiver essentially says: This did not arrive correctly or did not work.
Why it matters in practice
Helps develop and operate digital systems robustly, securely, and maintainably.
Example from business
A receiver requests a retransmission after a corrupted packet.
Limits and pitfalls
- Accepting NACK support even though the specific protocol handles errors differently.
Origin & history
ACK/NACK mechanisms are part of many communication and transmission protocols.
Use in mid-sized companies
- Possible example: A receiver requests a retransmission after a corrupted packet.
Frequently asked questions
What does Negative Acknowledgement (NACK) mean?
A protocol message indicating that data or an operation was not correctly received or executed.
What should one pay attention to?
Accepting NACK support even though the specific protocol handles errors differently.
Sources
Source verified on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
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