*Question G8C05:
In an ARQ mode, what is meant by a NAK response to a transmitted packet?*  

*Correct Answer is  A: Request retransmission of the packet*  

### AI Response: (may contain errors)  

In Automatic Repeat reQuest (ARQ) protocols, a NAK (Negative Acknowledgment) response indicates that a transmitted packet was not received correctly and needs to be retransmitted. 

### Explanation of the Correct Answer:
- **Correct Answer: A: Request retransmission of the packet**  
  A NAK response specifically signals to the sender that the packet was not received correctly, prompting the sender to resend the packet. This is crucial for ensuring data integrity in communication.

### Explanation of Incorrect Answers:
- **B: Packet was received without error**  
  This describes an ACK (Acknowledgment) response, not a NAK. An ACK indicates successful receipt of the packet.

- **C: Receiving station connected and ready for transmissions**  
  This does not pertain to the acknowledgment of a specific packet. It may refer to a general status but does not indicate any issues with packet reception.

- **D: Entire file received correctly**  
  This would also be indicated by an ACK for the entire file, not a NAK. A NAK specifically indicates that there was an error with a particular packet, not the entire file.

### Summary:
In ARQ protocols:
- **NAK** = Request retransmission of the packet (Correct)
- **ACK** = Packet received without error (Incorrect)
- General connection status or entire file acknowledgment does not apply to NAK responses.

Understanding these distinctions is key for the Extra Class exam and for effective communication in amateur radio.