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范增噙着泪水，重重地点点头。这是一个无处不在却不为人知的世界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.Lin Wei, founder of Golden Rainforest: "Recently, the country has issued a series of policies to rectify the off-campus training of K12 disciplines. However, the market demand is great, and counseling agencies of various disciplines are also seeking transformation. Therefore, quality education including thinking ability training will enter a faster development stage in the future. However, compared with subject counseling, the training of thinking ability is more comprehensive and the training process is more complicated. Therefore, higher requirements are put forward for the professional ability and industry cognition of industry practitioners. "先是编出这等小戏嘲讽人，又行此鬼祟伎俩，都是些……不入流的手段。高凡郁闷地发现，他成了戏台上唱白脸的奸贼。