幸运的是，这一过程已经被大量不同的免费开源工具所简化。

Fortunately, the process has been simplified by a number of different free and open source tools.

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Nmap 是一个用于网络检测或安全审计的免费开源工具。

Nmap is a free, open source utility for network exploration or security auditing.

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所有上述特性都有完整地文档、实例、主题以及100%免费开源软件。

All completely documented, demoed, themed, and 100% Free Open Source Software.

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