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312-50V9 · Question #361

What is the best Nmap command to use when you want to list all devices in the same network quickly after you successfully identified a server whose IP address is 10.10.0.5?

The correct answer is A. nmap -T4 -F 10.10.0.0/24. To quickly list all devices on the same /24 network as 10.10.0.5, the correct Nmap command uses -T4 for speed and -F for a fast scan of the top 100 ports on the correct subnet 10.10.0.0/24.

Scanning Networks

Question

What is the best Nmap command to use when you want to list all devices in the same network quickly after you successfully identified a server whose IP address is 10.10.0.5?

Options

  • Anmap -T4 -F 10.10.0.0/24
  • Bnmap -T4 -q 10.10.0.0/24
  • Cnmap -T4 -O 10.10.0.0/24
  • Dnmap -T4 -r 10.10.1.0/24

How the community answered

(26 responses)
  • A
    96% (25)
  • B
    4% (1)

Why each option

To quickly list all devices on the same /24 network as 10.10.0.5, the correct Nmap command uses -T4 for speed and -F for a fast scan of the top 100 ports on the correct subnet 10.10.0.0/24.

Anmap -T4 -F 10.10.0.0/24Correct

The -T4 flag sets aggressive timing for faster execution, and -F performs a fast scan by targeting only the top 100 most common ports rather than all 65535, making discovery quick. The subnet 10.10.0.0/24 is correctly derived from the identified server IP 10.10.0.5, ensuring all devices on that network segment are targeted.

Bnmap -T4 -q 10.10.0.0/24

The -q flag is not a valid standard Nmap option and would cause an error or be ignored, making this command unreliable for the task.

Cnmap -T4 -O 10.10.0.0/24

The -O flag enables OS detection, which requires additional probes and significantly slows down the scan - it does not satisfy the requirement of quickly listing devices.

Dnmap -T4 -r 10.10.1.0/24

This command targets subnet 10.10.1.0/24, which is a different network than the one containing the known server at 10.10.0.5, so it would not discover devices on the correct network segment.

Concept tested: Nmap fast host discovery on a subnet

Source: https://nmap.org/book/man-briefoptions.html

Topics

#Nmap#fast scan#network discovery#subnet scanning

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