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第PAGE\*Arabic\*MERGEFORMAT20页共NUMPAGES\*MERGEFORMAT20页信息安全原理及应用防火墙技术可以很好的保障计算机网络安全，为正常运行创造条件。对于一个网络安全防御系统而言，防火墙往往被看做是防御的第一层，可见防火墙技术在网络安全的重要性。关键词：网络安全；防火墙技术；重要性1/9abstractfirewalltechnologycanbeverygoodtoprotectthecomputernetworksecurity，tocreateconditionsforthenormaloperation.foranetworksecuritydefensesystem，thefirewallisoftenseenasthefirstlayerofdefense，visiblefirewalltechnologyinnetworksecurity.keyword：networksecurity;firewalltechnology;importance2/9目录摘要..................................................................................................................................................1abstract.............................................................................................................................................2前言..................................................................................................................................................4一、计算机网络安全问题...............................................................................................................4二、防火墙的基本介绍...................................................................................................................42.1.防火墙的定义.....................................................................................................................42.2防火墙的实现技术分类.............................................................................................................52.3防火墙的体系结构....................................................................................................................5三、防火墙技术的重要性...............................................................................................................63.1网络存取访问的统计与记录............................................................................................63.2控制特殊站点的访问........................................................................................................63.3控制不安全服务...............................................................................................
