Nmap is a free, open source utility for network exploration or security auditing.
Nmap 是一个用于网络检测或安全审计的免费开源工具。
Network access control is to ensure that the cyber source is not illegal, is the main strategy of network security and protection.
入网访问控制是保证网络资源不被非法使用， 是网络安全防范和保护的主要策略。
Network security auditing thoroughly covers the use of both commercial and open source tools to assist in auditing and validating security policy assumptions.
网络安全审计深入覆盖了商业和开源工具的使用，以协助审计和验证安全策略的假设。
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