2目录摘要······························································································3前言······························································································4一、课程设计目的意义·······································································6二、需求分析····················································································61、虚拟网···················································································62、管理与维护·············································································63、网络安全················································································71、防火墙技术·······································································72、建立网络入侵侦测系统························································73、反病毒防御··············