Beginner's Guide to Nmap

Beginner's Guide to Nmap: "Ever wondered how attackers know what ports are open on a system? Or how to find out what services a computer is running without just asking the site admin? You can do all this and more with a handy little tool called Nmap. What is Nmap? Short for 'network mapper,' nmap is a veritable toolshed of functionality to perform network scans. It can be used for security scans, simply to identify what services a host is running, to 'fingerprint' the operating system and applications on a host, the type"