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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.还是不懂。Um, * * Enhance Sa's "Document Number": Decree No.21 of the Ministry of Labor and Social Security of the People's Republic of ChinaMeet David Crosby in this portrait of a man with everything but an easy retirement on his mind.　　在宁静的丹麦小镇，一名17岁的少女和朋友们都发现了隐藏在他们小镇的令人不安的真相，她的世界因此而彻底颠覆。双手相握，虽然利益不同，但总算目的一致了。一群大律师、事务律师和他们的徒弟为捍卫法治精神、巩固司法制度、维护市民的公义、平等，一直坚守岗位，克服种种的挑战及困难。一班律政界新血，在接触形形色色的棘手案件时，体会到人性的本质、对梦想的迷茫。这些艰苦的人生历练，令他们更加明白平等、公义的真正意义。