The 'nmap' command is widely used by attackers to discover open ports and services on a target machine. It can provide detailed information about networked systems that could be exploited for vulnerabilities. Other commands like 'ls', 'grep', and 'ps' are standard commands used for file listing, pattern searching, and process listing, respectively, and are not typically used for network scanning.
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What is the purpose of using 'nmap' in network security?
What are open ports, and why are they important in security?
How can 'nmap' be used ethically in network security?