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ACK reflection attack is a common reflection attack technique, Using TCP three-way handshake, When the source IP address of SYN is disguised as Target's IP and the transmitter try to establish TCP connection, the reflector's response will be directly forwarded to Target. In the process of attack, a large number of ACK responses responded by the reflector will be sent to Target by controlling a large number of controlled hosts to perform the clock operation, thus occupying Target's network bandwidth resources and causing denial of service.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.　　女儿的睡前故事……《第一次亲密接触》带来的最大影响就是，网络上无数男女开始相互表白，因为现实压力而无法走到一起的网络情侣也开始大胆地向前迈进。活泼可爱的乡村姑娘罗小蔓本来与年迈的婆婆在乡村过着无忧无虑的生活，然而一个自称是小蔓父亲朋友的男人(刘文达)的出现，小蔓便开始了他牵魂动魄的南国都市生活，面对文达的太太舒云的猜疑，家贝、舒风的刁难，倔强的小蔓为了实现作名设计师的梦想一再忍受