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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.In fact, the promotion of sweet potatoes is more important outside, for example, the following officials shirk their responsibilities to...　　有这么一个故事，说的是洞里有两只耗子，饿极了都不敢出去，生怕外面有猫，终于有一天，其中一只耗子实在扛不住，就出去了。它的下场如何，没人知道，唯一知道的是，洞里那只耗子，肯定是饿死了。郑帅犯下大错，被父亲郑儒同强制安排到军营当兵。他和于四福、白航大闹武装部，正疲于应对同样是新兵的“毒舌”蒋小资和“金算盘"马贤林时，宿敌黄俊龙偏偏又出现在这里，顿时武装部大院一片喧嚣。亚丁顿教授召结了一群在心理临床领域表现杰出的得意门生，展开一项神秘研究。年仅14岁的117病患小莱，五岁就被送到收容机构与世隔绝，她似乎拥有能预知并操弄人心的神秘力量。因此，研究员们只能透过监视屏幕，远端观看小莱的生活图像，然而，其中一名研究员麦蒂逊开始觉得事情有些不对劲，她发现自己脑海渐渐被小莱的声音盘据，不时出现断片的状况，甚至接连有研究员离奇丧命，且事发时间都与小莱的异常反应时间重叠。随着麦蒂逊锲而不舍地追查，隐藏在单纯研究背后的恐怖真相也将呼之欲出。最终，桃园行动组彻底覆灭。