312-50V9 · Question #450
What type of OS fingerprinting technique sends specially crafted packets to the remote OS and analyzes the received response?
The correct answer is C. Active. Active OS fingerprinting involves deliberately crafting and sending packets to a target and analyzing the responses to determine the OS.
Question
What type of OS fingerprinting technique sends specially crafted packets to the remote OS and analyzes the received response?
Options
- APassive
- BReflective
- CActive
- DDistributive
How the community answered
(33 responses)- B3% (1)
- C91% (30)
- D6% (2)
Why each option
Active OS fingerprinting involves deliberately crafting and sending packets to a target and analyzing the responses to determine the OS.
Passive fingerprinting never sends packets to the target; it only analyzes traffic already flowing on the network, such as sniffed packets.
Reflective is not a recognized OS fingerprinting technique category in security terminology.
Active fingerprinting probes the target by sending specially crafted TCP, UDP, or ICMP packets and examining how the remote OS responds to edge-case protocol behaviors. Tools like Nmap use active techniques such as TCP ISN sampling, IP ID sequencing, and TCP options analysis to fingerprint the OS stack.
Distributive is not a recognized category of OS fingerprinting techniques.
Concept tested: Active vs passive OS fingerprinting methods
Source: https://nmap.org/book/osdetect.html
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