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从访问控制和通信安全二方面论述了Ｉｎｔｅｒｎｅｔ的安全机制，介绍了防火墙的２种实现方法和３种体系结构，并分析了各种体系结构的优缺点。
The security mechanism of Internet is discussed from two aspects of access control and communication security. Two kinds of implementation methods and three kinds of architecture of firewall are introduced, and the advantages and disadvantages of each kind of architecture are analyzed.