防火墙技术指南
具体介绍了防火墙的原理，使用，如何配置及其发展前景，个人认为很全面，对学习网络安全的午饭很有帮助(The principle, use, configuration and development prospects of the firewall are introduced in detail. Personally, I think it is very comprehensive, and it is very helpful for learning network security lunch.)
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