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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.有花堪折直须折，莫待无花空折枝。Thirdly, the results of the exercise are not positively related to time, which also depends on the exercise method. Eriksson cited many examples in the book, and there are also some people around us who seem to work hard but have not achieved anything. During the practice, do we adopt the strategy of phased progress, adjusting with time and effect, with pertinence and skill, or do we mechanically spend several hours a day just to achieve the goal of "10,000", but we have never found a more effective training method, and cannot identify and make up for the loopholes in the practice so as to make progress? The difference between them is ultimately the difference between "senior novice", competent person and expert.5.12 Serious autonomic nervous system diseases are unqualified.Outstanding figures in all fields rely on a lot of practice//022I like this kind of popular science一个持械抢劫犯从监狱越狱了，他想找到他从前同监的狱友，因为他遭到了狱友的陷害，替他背负了连环杀手的罪名。有一名叫克莱尔的女警察开始追踪越狱者，但是该女警本身就是头号公敌。当他们追逐别人的时候，也有人跟在他们背后，究竟谁是猎物，谁又是猎人？