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如何构筑一个安全的网络体系，是众多网络用户关心的问题。本文介绍了一种应用于局域网的 防火墙设计方案，并对其结构、功能、软硬件配置等分别进行了论述。
How to build a secure network system is the concern of many network users. This paper introduces a firewall design scheme applied to LAN, and discusses its structure, function, hardware and software configuration respectively.