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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.The fishery administration ship dragged us back to Shidao Dock. It was raining heavily that day. There was a bus parked on the shore and an ambulance. Twenty or thirty people were there. The armed police took us down with our hands tied behind our backs. We got on the bus first and didn't drive far away. The police didn't know where to come from. They hid before and did not dare to let us see them. They didn't show up until they all landed. Then one person and one police car took them to the police station.　　本片荣获1983年青年艺术家奖最佳动作片奖。(a) According to the provisions of the medical security management and the agreement to provide medical services;When the speed is lower than 100 kilometers at 3 o'clock, a safe distance of more than 50 meters should be kept.　　新版我亲爱的小冤家