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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.那汉子见他累得满头大汗，不禁大笑道：我玩不来，还是你陪着吧。男子扬长而去，何永强目送足够远之后，才关上了庭门，随即露出冷笑，边走边笑，抑制不住，最终大笑出声。　　巡山队员在遍布危险的茫茫大戈壁上奋力追踪，终于，盗猎者出现在冰河对岸，队员们不顾一切地冲入湍急的冰河之中。一场生死搏斗之后，只捕获了一些盗猎分子， 狡猾的盗猎头子再次漏网……《刺猬和熊猫小姐》讲述了像刺猬一样竖起刺的敏感青年与像熊猫一样天下太平，糊里糊涂的熊猫小姐相遇，两人吵吵闹闹，逐渐发展为甜蜜恋人的浪漫爱情喜剧。东海在剧中将以刺猬发型亮相，完美变身刺猬先生。尹胜雅将在剧中展现清新可爱的魅力。两位主人公与刺猬，熊猫的相似度令人期待。花生从小跟玉米好，也看我不顺眼。三人先拜见了各位，然后陈述了探望老将军的理由。