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Nmap
Nmap ("Network Mapper")
Screenshots
Hunter's comment
Nmap tool is one of the most powerful tools used in penetration testing process, its function is that it performs a careful examination of any system or network and by gathering information about the target, such as open ports (port), and if it is in a firewall, loyalty, and type of system
The tool has a ZEMAP graphical interface and is an essential tool in any penetration testing system.
Link
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