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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.The delegate is a class, which can also be instantiated. The method is assigned to the delegate instance through the constructor of the delegate.李晨光是90后阳光帅气的大男孩，是某大型企业的总经理，有一位漂亮的老婆，她叫何佳美；何佳美貌美如花深爱着李晨光，何佳美有个无血缘关系的哥哥，也深爱着何佳美。平静的生活中，李晨光的身边出现了一名叫罗小曼的女人，何佳美怀疑老公对自己不忠心，雇佣侦探社老板，把故事的剧情引到了高潮，车祸、鬼娃、恐吓、步步紧逼……历史频道的外星人UFO题材悬疑剧集《蓝皮书计划》续订第2季，仍为10集。夏日的皇家训练营即将开始了，侯特妮公主来到了集中点。可是，即使到了开船时间，侯特妮依然没有听到自己的…The Source class is a decorated class, and the Decorator class is a decorated class. You can dynamically add some functions to the Source class. The code is as follows:杀猪匠杨锅三，到县城为村里的小白寡妇卖驴，无意间被裹挟进了汉奸的游行队伍，自此发生了一系列误打误撞的事，使他成为大家眼里的汉奸。为洗刷汉奸的污名，也为了给死去的乡亲报仇，杨锅三决心炸掉鬼子的炮楼。