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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.　　Club Friday The Series 6 本季故事主题为爱没错，其中第三个故事《爱本没错，错在朋友也爱》决定拍摄第二季。In most languages, it is the same as annotation. The statements in this are not executed.This method hides all < p > elements:2传闻牧雄香织Sakagami Tamori211. X.X.188