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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.1. Develop an event response processAmplification attack is a special kind of reflection attack, Its special feature is that the reflector has an amplifying effect on network traffic, so we can also use this reflector as an amplifier, and the way of amplifying attack is basically the same as that of reflecting attack, except that the network service provided by the reflector (amplifier) needs to meet certain conditions.……赵文华神色一动，这问题其实他自己也想过，不过杨长帆行事老实，该贡的都贡，做事又快又好，实在挑不出毛病。　　当妈妈不容易，当单亲妈妈更难。周南南坚信靠自己也能给儿子小阳创造幸福生活，但是在“幼升小”的关键节点上，她深刻地体会到了工作家庭难两全的困境。幼儿园里其他看似光鲜的妈妈们，也各有各的烦恼。回归家庭的女强人发现自己还不如保姆能干，把丈夫孩子当成业绩的全职太太苦恼于无人喝彩，在孩子身上寄托自己未竟梦想的小店主正在为虚荣付出代价，十指不沾阳春水的白富美一夜之间要直面生活的风风雨雨。孩子几岁，妈妈就是几岁，谁也不是天生就会当妈。鸡血还是放养，一切为了孩子还是坚定地做回自己？在误会、冲突与和解之后，这群幼儿园里面的妈妈们，在守护着孩子们迈过“幼升小”这个人生重要阶段的同时，也收获了自己的成长。He has another characteristic, that is, his loud voice. Every time class was over, he was shouting, even the teacher's office could hear him. In the future, when the school radio is bad, please ask Lin Nian to talk about it. The whole world can hear it!