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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.此后，嘉夜又偶遇杜谦永的孪生弟弟，放浪不羁的杜谦In this architecture, data packets are first collected by splitting or mirroring for attack detection. Then the attack detection module uses the detection algorithm to detect the attack. Although there are many attack detection methods such as Depth Package Analysis (DPI) and Depth/Dynamic Flow Detection (DFI) based on machine learning principles in academia, from the perspective of engineering efficiency, building traffic models and setting security thresholds or security baselines should be the most efficient methods. Although there are many types of DDOS attacks, their purpose is unique-to consume resources. Therefore, in the attack detection phase, the type of DDOS attack is not important, what matters is whether DDOS attack has occurred. At present. Even if the attack detection method of setting traffic threshold is adopted, it still faces the problem of how to set reasonable traffic threshold in many services.新闻报道了怪盗团事件嫌疑人的莲自杀的消息，同时怪盗团也开始暗中展开行动。为了揪出策划所有事件的幕后人物并让其改过自新，怪盗团决心潜入新目标的魔宫，并盗出宝物。根据东野圭吾畅销悬疑小说《长长的回廊》改编。回廊亭大宅中暗藏无数秘密，绝望女人为爱复仇的欲望纷争正在上演！At present, many large financial institutions have begun to strengthen the DDoS defense system, but observers worry that attackers will shift their targets to smaller banks, credit cooperatives and even other industries.