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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.同时认定胡亥荒淫无道，以至天下离心离德，硝烟四起，故而废黜其皇帝身份，以黔首之礼下葬于咸阳以东的杜南宜春苑。No.84 Alden Richards　　小分队内部的猜忌越来越严重，众人身上仿佛都有疑点，洪风锁定了莫三甲为叛徒，莫三甲却拿出证据证明洪风才是叛徒，小分队一度濒临绝裂……泰国版《宫》改编自韩国同名电视剧《宫》..那我先回去了，还约了人谈事，今后咱们约定，每日申时四刻来取货。