A cybersecurity analyst needs to create a detailed inventory of network devices. The primary goal is to identify all running services and their versions. The scan must be as unobtrusive as possible to avoid disrupting critical operations on the internal network. Which of the following Nmap commands best achieves this?
The command nmap -sV -T2 is the most suitable option. The -sV flag enables service and version detection, which directly addresses the primary goal of creating a detailed inventory of services. The -T2 (Polite) timing template slows down the scan to reduce network load and the likelihood of disruption, fulfilling the requirement to be unobtrusive.
The command nmap -O -T4 is incorrect because the -T4 (Aggressive) timing is likely to cause network disruption, which violates a key constraint of the scenario.
nmap -sn is a ping scan that only identifies live hosts without scanning for open ports or services, so it would not create a detailed inventory.
The command nmap -Pn -T4 is inappropriate as it also uses the disruptive -T4 timing and does not explicitly request service version details.
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What does the `-sV` flag in Nmap do?
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Why is `-T2` used instead of `-T4` in this scan?
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What is the difference between `-O` and `-sV` in Nmap?