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介绍防火墙技术，防火墙选择标准及其部署方案，讨论目前应用较多的入侵检测技术。从防御和入侵检测两个方面分析了网络信息安全的保护方法。
Introduce the firewall technology, firewall selection criteria and deployment options to discuss the current application of more intrusion detection technology. From the defense and intrusion detection two aspects of network information security protection methods.