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DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.老夫人听了忙道：谁不是这么说呢。Prunus cerasus European sour cherry (to tell the truth, I don't know if this translation is reliable.　　他在异世界接下的任务只有一项──「杀了被预言会带给人类灾厄的『勇者』」。　　影片围绕着四个12岁叛逆男孩展开，他们想要在父母回家前从洛杉矶郊区前往市中心换掉被摔坏的无人机。……在启明，消费订阅或者打赏某本书，都会得到一个粉丝值。