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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.By Lemon只是勉强挤出一个微笑，然后默默离开。田遥一向高傲，这时怒道：那你回岷州去找黎将军论学好了，不用在这里歪缠。　　当时的省委为了让齐全盛放开手脚搞改革，将刘重天调离了镜州。然而不幸的事情发生了：刘重天的夫人在调离搬家的途中遇车祸瘫痪，儿子死亡，刘重天就此背上了沉重的包袱。因此，刘重天带着省委调查组的同志查处镜州问题，让齐全盛从思想上难以接受，由此认定自己会遭到陷害。齐全盛十分自信：他从来没为自己夫人、女儿批过条子，做人堂堂正正。更重要的是，镜州在他押上身家性命的拼搏中崛起了，经济名列全省第一，他也得到了镜州老百姓真诚的支持和爱戴。一直都是古井不bō的，十分的沉稳。