0 Nmap is an advanced Unix-based port scanner. It can be used to audit your network, test your router and switch configurations, test your firewall configurations, and identify the nature of suspicious remote systems.
0 You can use Nmap as a basic port scanner for a system on your internal network, or you can have it identify the operating system version of a remote system on another firewall-protected network. Nmap is capable of manipulating aspects of TCP to hide its scans from firewalls.
0 Nmap's "interactive mode" allows you to do two things that you should be aware of as a systems administrator: It can conduct multiple Nmap sessions, and it can disguise the fact that it is running on your system.
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