NACK meaning in Networking ?

Answer: What is Negative Acknowledge mean?

In data networking, telecommunications, and computer buses, an acknowledgment (ACK) is a signal that is passed between communicating processes, computers, or devices to signify acknowledgment, or receipt of message, as part of a communications protocol. The negative-acknowledgment (NAK or NACK) is a signal that is sent to reject a previously received message or to indicate some kind of error. Acknowledgments and negative acknowledgments inform a sender of the receiver's state so that it can adjust its own state accordingly.

Many protocols contain checksums to verify the integrity of the payload and header. Checksums are used to detect data corruption. If a message is received with an invalid checksum (that is, the data received would have a different checksum than the message had), the receiver can know that some information was corrupted. Most often, when checksums are employed, a corrupted message received will either not be served an ACK signal, or will be served a NAK signal.

reference

Full Form	Category
National Advisory Committee on Kangaroos	Business
Nature And Conservation for Kids	Community
Negative Acknowledgment	Computer and Networking
Network of Anyone Collecting Keychains	General
North Alabama Canoe Kayak	General
North Atlantic Canoe and Kayak	General
North Alabama Canoe and Kayak	General
Negative ACKnowledgement	Information Technology
Negative Acknowledge	Networking