Many freelancers work in the data network industry. In the telecommunications industry and data networking industry, an acknowledgment is a signal passed between communicating processes or computers to signify acknowledgment as part of a communications protocol.
Negative acknowledgment or NAK refers to the message which the sender receives when a message is not sent, or a corrupt message is sent is referred to as NAK (Negative acknowledgment). This message might also show that the receiver’s station is not ready for transmission. Whenever this type of message is displayed, it’s mandatory to send the message again.
See below example of TCP ACK NAK protocol:
One example of Negative Acknowledgement is the internet’s Transmission Control Protocol (TCP). When computers communicate via TCP and received packets, they are acknowledged by sending back a packet with an acknowledgment bit set.