The principles and some familiar open source tools of network security technologies are summarized, based on which a platform of network attacking & defense and its architecture are presented and a virtual network environment is also implemented.

• 本文总结了网络安全技术的基本原理和一些常见的开放源码网络安全工具，在此基础上提出了网络攻防平台及其总体结构框架，实现了网络攻防平台的虚拟网络环境；