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2, should fish, not cast a netOn 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.根据1989年同名喜剧改编，讲述加州州长Zack Morris因为把太多低收入高中关门而陷入水深火热的地步，故此他决定把受到影响的学生都送到加州最好的学校 – Bayside高中。High Cost Density Tests Operators论理，我是哥哥，该排在前面才对。Rules for OUTPUT can exist in: raw table, mangle table, nat table, filter table.