312-50V10 · Question #41
Which Nmap option would you use if you were not concerned about being detected and wanted to perform a very fast scan?
The correct answer is B. -T5. Nmap's -T5 Insane timing template performs the fastest possible scan by minimizing delays between probes, at the cost of accuracy and stealth.
Question
Which Nmap option would you use if you were not concerned about being detected and wanted to perform a very fast scan?
Options
- A-T0
- B-T5
- C-O
- D-A
How the community answered
(24 responses)- A4% (1)
- B92% (22)
- D4% (1)
Why each option
Nmap's -T5 Insane timing template performs the fastest possible scan by minimizing delays between probes, at the cost of accuracy and stealth.
-T0 is the 'Paranoid' timing template - the slowest and stealthiest option, sending one probe every 5 minutes to evade IDS, which is the opposite of what is needed here.
The -T5 'Insane' timing template sets the most aggressive timing parameters in Nmap, sending packets as fast as the network and target can handle. It is designed for scenarios where speed is the priority and detection is not a concern, making it the correct choice for a fast, overt scan.
-O enables OS detection by analyzing TCP/IP stack responses and does not control scan timing or speed.
-A enables aggressive scanning including OS detection, version detection, script scanning, and traceroute, but does not set the fastest timing template on its own.
Concept tested: Nmap timing templates for scan speed control
Source: https://nmap.org/book/performance-timing-templates.html
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