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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.In other words, users in BIO are most concerned about "I want to read", users in NIO are most concerned about "I can read", and users in AIO model need to pay more attention to "finished reading".This shocking poem is a love poem written by poet Yu Xiuhua in October 2014.When the SYN gateway receives the SYN packet from the client, it directly forwards it to the server. After receiving the SYN/ACK packet from the server, the SYN gateway forwards the packet to the client and sends the ACK confirmation packet to the server in the name of the client. At this time, the server enters the connected state from the semi-connected state. When the client confirms the arrival of the packet, it forwards if there is data, otherwise it discards it. In fact, the server has a connection queue in addition to maintaining the semi-connection queue. If SYN attack occurs, the number of connection queues will increase, but the number of connections that the general server can withstand is much larger than the number of semi-connections, so this method can effectively reduce the attack on the server.玉米和扁头只得在家里混，偶尔跑到外面林子里玩，刘管家就让孙鬼看着他们。板栗听得咳嗽起来，差点把饭呛进鼻子，苦着脸道：娘，就喝了一碗青菜汤，你就说了这一长串。Mode of action: Purple bubbles are generated by the affected object, and HP is reduced every 0.5 S for the poisoned object.