312-50V10 · Question #494
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. The -F flag enables fast mode in Nmap, scanning only the 100 most common ports, which combined with -T4 aggressive timing is the quickest way to enumerate live hosts on the correct /24 subnet.
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
(25 responses)- A76% (19)
- B8% (2)
- C4% (1)
- D12% (3)
Why each option
The -F flag enables fast mode in Nmap, scanning only the 100 most common ports, which combined with -T4 aggressive timing is the quickest way to enumerate live hosts on the correct /24 subnet.
nmap -T4 sets aggressive timing to minimize scan delays, and -F enables fast mode by limiting the scan to the 100 most commonly used ports instead of the default 1000, significantly reducing scan time. The target subnet 10.10.0.0/24 correctly matches the identified server at 10.10.0.5.
-q is not a valid Nmap flag and would cause the command to fail or be ignored.
-O enables OS detection via TCP/IP fingerprinting, which adds significant overhead and is slower than a basic host/port discovery scan.
-r disables port randomization and does not speed up discovery; additionally, the subnet 10.10.1.0/24 is incorrect for a server at 10.10.0.5.
Concept tested: Nmap fast host discovery with -F and -T4 flags
Source: https://nmap.org/book/man-performance.html
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