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文中就信息网络安全内涵发生的根本变化，阐述我国发展民族信息安全体系的重要性及建立有中国特色的网络安全体系的必要性。论述了网络防火墙安全技术的分类及其主要技术特征。
Referring to the changes about the essence of the safe information network, the article depicted the importance of national information network safety and the necessity of establishment of the system of the network safety with Chinese characteristics, and presented the technical sorting and features of the network firewall.
同时，各类蠕虫病毒各具特色，演绎了一场又一场长江后浪推前浪的安全事件。新病毒的攻击力变得越来越强大，一旦爆发，其破坏力十分惊人，而且影响面相当大，它们无孔不入，不易清除。目前的安全解决方案，像防毒软件、防火墙、弱点评估、入侵侦测与预防系统，都无法有效阻挡这些病毒。
Meanwhile, worm viruses with various features brought about series of safety events one wave after another. And new viruses with more attack power have the surprising destruction force as they broken out, and have broad influences. They are all-pervasive and not easily cleansed. However, the present solution, such as anti-virus software, firewall, evaluation of weakness, inspection of