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Nmap, short for Network Mapper, is a free and open source tool used for vulnerability checking, port scanning and, of course, network mapping. Despite being created back in 1997, Nmap remains the gold standard against which all other similar tools, either commercial or open source, are judged.

Nmap has maintained its preeminence because of the large community of developers and coders who help to maintain and update it. The Nmap community reports that the tool, which anyone can get for free, is downloaded several thousand times every week.

Because of its flexible, open source code base, it can be modified to work within most customized or heavily specialized environments. There are distributions of Nmap specific to Windows, Mac and Linux environments, but Nmap also supports less popular or older operating systems like Solaris, AIX or AmigaOS. The source code is available in C, C++, Perl and Python.

Nmap is an indispensable tool that all techies should know well. It is used by all good ethical hackers, penetration testers, systems administrators, and anyone in fact who wants to discovery more about the security of a network and its hosts. You cannot be a good ethical hacker or systems administrator without being an expert in Nmap.The ideal student for this course is technically minded with an interest in ethical hacking and network security.