Analyzes the principles of network security scan, categories the techniques used in a scan process, presents the concept and protocols each technique derives from.

分析了网络安全扫描的原理，对扫描中使用的主要技术进行了分类，并阐述了每种技术的原理及协议特性。

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Network security leak scan and vulnerability analysis are the base of system security evaluation and the essential components of Information security system.

网络安全漏洞扫描与脆弱性分析是进行系统安全评估的基础和信息安全保障体系中的必要组成部分。

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Network security assessment is a complex system engineering. Most of current security evaluation tools are only used to scan and detect the security vulnerabilities of network system.

网络安全评价是一复杂的系统工程，现有的安全评估工具大都只是用于对网络系统安全漏洞进行扫描、检测。

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