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由于目前网络安全问题的日趋严重， ＤＤＯＳ（ Ｄｉｓｔｒｉｂｕｔｅｄ Ｄｅｎｉａｌ ｏｆ Ｓｅｒｖｉｃｅ，分布式拒绝服务攻击）的攻击手段严重威胁 Ｉｎｔｅｒｎｅｔ的安全。文章详细地介绍了什么是 ＤＤＯＳ及其造成的危害，Ｗ理论上分析了其体系结构和运作情况，并实际列举了一些著名的ＤＤＯＳ 工具及其特点，尝试提出有关ＤＤＯＳ的攻击检测规则和相关的检测工具。
Due to the current increasingly serious network security issues, DDOS (Distributed Denial of Service, distributed denial of service attacks) means a serious threat to the Internet security. The article describes in detail what is DDOS and its harm, W theoretically analyzes its architecture and operation, and actually lists some well-known DDOS tools and their characteristics, try to put forward DDOS attack detection rules and related Detection Tool.