Which option initiates a UDP scan?

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Multiple Choice

Which option initiates a UDP scan?

Explanation:
The UDP scan is started by using the UDP probe option. This flag tells Nmap to send UDP packets to the target ports and interpret the responses (or lack thereof) to determine port state. The -sU flag is specifically for UDP scanning. In contrast, the other options represent different TCP-based scan techniques—NULL, FIN, and Xmas—each manipulating TCP flags rather than probing UDP ports. So the best answer is the UDP scan option.

The UDP scan is started by using the UDP probe option. This flag tells Nmap to send UDP packets to the target ports and interpret the responses (or lack thereof) to determine port state. The -sU flag is specifically for UDP scanning. In contrast, the other options represent different TCP-based scan techniques—NULL, FIN, and Xmas—each manipulating TCP flags rather than probing UDP ports. So the best answer is the UDP scan option.

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