The nmap tool provides the ability to scan for hosts across your network.

nmap工具提供了在整个网络上扫描主机的功能。

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You can see an example of this in Listing 4, where you are comparing the output of two executions of nmap on the same host.

您可以在清单4中看到相关的示例，其中对同一台主机两次执行nmap所得到的输出进行了比较。

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The easiest way to do this is to run nmap, record the output, and then use a tool like diff to compare the output and report the changes.

要完成这项任务，最简单的方法是运行nmap，记录其输出，然后使用像diff这样的工具，以便对输出信息进行比较，并报告其中的更改。

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He then used the scanning tool NMAP to dig up thousands of vulnerable machines visible on the Internet.

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Bowes, a consultant with Dash9 security and a developer for security scanning tool NMap, says he collected the passwords to help researchers figure out how users choose passwords and make the authentication process more secure.

FORBES: Researcher Creates Clearinghouse Of 14 Million Hacked Passwords