nmap is one of the most useful tools for a security consultant in a penetration testing environment. It has a massive range of options, and only the most basic will be considered in this tutorial.
It goes without saying, that nmap should only be run against IPs and ports that you yourself have gained authorization to test. Here goes:
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Tags: daemon, ethernet, firewall, frame, ftp, header, ids, IP, mangle, nmap, paket, pen test, pen testing, penetration testing, POP3, port, security, Security Consultant, security consulting, socket, tcp, timing, udp