Nmap is a powerful network scanner used to identify systems and services. Nmap was originally developed with network security in mind, it is a tool that was designed to find vulnerabilities within a network. Nmap is more than just a simple port scanner, you can use nmap to find specific versions of services and OS system types.
References:
10 nmap Commands Every Sysadmin Should Know. (n.d.). Retrieved March 2, 2015, from [ Ссылка ]
