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随着计算机网络系统的飞速发展和广泛应用，网络及信息安全问题越来越受到人们的高度重视。本文分析了网络信息安全的主要问题及对策，对防火墙的功能及应用作了说明。
With the rapid development and widespread application of computer network systems, the issue of network and information security has attracted more and more attention. This paper analyzes the main problems of network information security and countermeasures, and explains the function and application of firewall.