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

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abstractfirewalltechnologycanbeverygoodtoprotectthecomputernetworksecurity，tocreateconditionsforthenormaloperation.foranetworksecuritydefensesystem，thefirewallisoftenseenasthefirstlayerofdefense，visiblefirewalltechnologyinnetworksecurity.keyword：networksecurity;firewalltechnology;importance

2/9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...................................................................................................................4

2.1.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