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防火墙是保障网络安全的重要措施。本文阐述了INTRANET防火墙的工作机理，类型和拓扑结构；分析了各类防大墙的特点；并对构造防火墙的原则作了简单的探讨。
Firewall is an important measure to ensure network security. This paper describes the work mechanism, type and topology of INTRANET firewall; analyzes the characteristics of various types of anti-big wall; and makes a simple discussion on the principle of constructing firewall.