Computer Science for IGCSE & O level - Data Transmission (Section 8 - No. 31)
What's the purpose of a negative acknowledgment (NAK) within the ARQ protocol?
To indicate the data has been received without errors.
To request a retransmission of the data.
To signal the end of the transmission.
To confirm the encryption process.
Explication
A NAK signals that retransmission is needed.