"One of the best ways to see if you have open ports or visible
network vulnerabilities is to do the same thing that an attacker
would do -- scan your network.
"By scanning your network with the same tools that security
researchers (and attackers) use, you'll see what they see. Among
the most popular network scanning tools is the open source nmap
tool). For Windows users, the Nmap download now includes a
graphical user interface, so it's now easier than ever to scan your
network with industry standard tools, for free."
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