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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.板栗两眼一眯，向他踏进一步，沉声问道：你说什么？是我挑衅起来的？青年被他陡然升起的凌厉气势吓了一跳，强撑着不后退。　　这是个假情敌变真情侣的故事，Pi（陈普明 ）是牙医学院的大二生，他一直暗恋着联合健康学院风云人物Mueang Nan（汪始慧），后来在好友Duen（Neo Trai Nimtawat）帮助下，为了喜欢的人脱胎换骨，就在他试图接近Mueang时，发现他身边一直跟着一个医学院大二生M ork（Pond Naravit Lertratkosum），他帅气聪明优秀和Mueang关系要好让pi很嫉妒，Pi将Mork当作情敌，而Mork想和他做“朋友”，好帮手Duen也有自己的感情纠葛.....他便出神，心想大舅舅难道真的小气？这怎么可能呢。一次有不能准备太多，费时费力，而且并不方便，所以这个炉温十分有限，若非如此,便可以打造出来更多的神兵利器。韩庆听了大喜，又道：好看不好看不要紧，要会生养娃才成。詹姆和莉莉靠网络为生，精心地养育他们女儿。当一个神秘的群发短信发布全国范围，引发了世界末日般的网络灾难