Question
In an ARQ mode, what is meant by a NAK response to a transmitted packet?
Answer Options
- A) Request retransmission of the packet
- B) Packet was received without error
- C) Receiving station connected and ready for transmissions
- D) Entire file received correctly
Correct Answer: A
Explanation
ARQ (Automatic Repeat reQuest) modes like PACTOR and Winlink are handshake-based systems designed for reliable data transmission. After a packet of data is sent, the receiving station checks it for errors using checksums.
If the packet contains errors, the receiving station sends a specific response known as a NAK (Negative Acknowledgment). A NAK response means to request retransmission of the packet, indicating that the data was received but was corrupted and must be sent again to ensure data integrity.
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