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王小虎身手不凡且具侠义心肠，一次到湖舫用膳时巧遇黑帮大会，同时发现有恶霸在场横行霸道，王小虎正义感大发，踢出其看家本领──降龙十八腿，击倒恶霸，最终还误打误撞取去黑帮视之如宝物的一道金牌。原来金牌是亚洲犯罪集团罗刹教教主火云邪神所颁的罗刹令，凡持有罗刹令者便拥有与罗刹教合作的专利权。繁华都市，人群熙来攘往，每个人都怀揣着美好愿望等着属于他和她的缘。任何地方都会发生美丽的故事，也许是在商场、也许是在咖啡馆，又或许，是在地下铁……但是他应该奏报汉王的。或者说，以他这样的能力和水平，如果不成功，反倒是有些天理不容了。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.10The above analysis shows that one of the first three situations will inevitably occur after intercepting down, so intercepting down is no longer considered here. Let's look at the difference between events after intercepting down.