In CEH v13 Module 03: Scanning Networks, Nmap includes timing templates for controlling the speed and stealthiness of scans.
-T5: Insane mode – very fast, highly aggressive, easily detectable.
-T0: Paranoid mode – very slow and stealthy.
-O: Enables OS detection (not related to scan speed).
-A: Enables OS detection, version detection, script scanning, and traceroute (comprehensive but not specifically about speed).
Therefore:
If speed is your goal and you are not concerned about detection, then:
-T5 is the correct answer.
[Reference:, Module 03 – Nmap Timing Options, Nmap Documentation: https://nmap.org/book/man-performance.html, , , ]
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