CNET Glossary: ACK - CNET Reviews

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CNET GLOSSARY: Terms for the techie

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ACK
acknowledgement
When a modem receives a data packet, it sends a signal back to the sending modem. If all the data is present and correct, it sends an ACK (acknowledgment) signal, which acts as a request for the next data packet. If the modem doesn't receive all the data, it sends back a negative acknowledgment, or NAK.

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