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你一声咳嗽，我便知你是谁。On the one hand, the core components of the network infrastructure have never changed in the past ten years, which makes some discovered and exploited vulnerabilities and some mature attack tools have a long life cycle and are still valid even today. On the other hand, the rapid development of the application of the Internet seven-layer model has diversified the attack targets of DDoS. From the web to DNS, from the three-layer network to the seven-layer application, from the protocol stack to the application App, the endless new products have also given hackers more opportunities and breakthrough points. Moreover, DDoS protection is a project with unequal technology and cost. Often, the construction cost of a business's DDoS defense system is larger than the cost or benefit of the business itself, which makes many start-up companies or small Internet companies unwilling to make more investment.板栗连声道：没有就没有。与白羊王，楼烦王也多有联系。就是不放心哥哥，想看看你。So how to calculate the attack mechanism of specific romance?哎呀，前几天还是夏天来着，怎么突然树叶凋零，草木枯萎，刮起寒风，冬天来了？不知不觉已经一月一日了。