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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.虽然Hannah Baker的故事已经说完了，但《十三个原因 13 Reasons Why》的故事仍旧在继续，Netflix正式宣布续订这部根据同名小说改篇﹑在校园界略具争议的剧集第二季，并且Brian Yorkey会接替Diana Son成第二季制作人。在首季讲述了女主为何会自杀后，第二季则会讲述她的死亡引起的余波﹑其他人复杂的康复旅途；第二季集数为13集，预定18年播出。杨长帆继而介绍道，在此的，皆是高官名将的家眷，用一个人，可以换回十个人，我抓他们不是为了一时痛快，只求换来诸位家眷。该剧讲述的是虽然学校内部发生了和社会事件样凶残的青少年犯罪，但却因为是青少年而处罚力度不足。剧中尹鈞相虽然是胜率第一的律师，但以一个事件为契机跌入深渊。为了恢复名誉，他以临时教师的身份进入了与事件有关的高中。在当老师的时候，校园里发生的各种青少年犯罪触目惊心，他站在弱势学生的一边，代表他们发出的声音。The mobile phone experts around youExtended Data: