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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.第四季依然由Reece Shearsmith和Steve Pemberton两位怪才主演，依然是6集。是啊。　　文革的号角在不经意间吹响，历史的洪流彻底的改变了所有人的命运……慕容瑶被划成黑五类，于振亚被打成走资派。于红趁势做了造反派，成为工厂造反派小头目，而她暗恋的匡逸夫父亲被打成走资派，被关押在他们厂的“小黑屋”中。大串联、自杀、红卫兵、造反、走资派、右派、强奸……轰轰烈烈的年代里，爱情、亲情、友情已经全被被扭曲，或丑陋或纯真的人性表露无遗……在他身旁，一身着灰色锦袍的青年并排骑行，正是胡宗宪如今的首席幕僚夏正。现在西班牙人并没有来菲律宾的打算，再者我国也不会坐以待毙。