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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.6. Use Your Customers to Find Customers《女儿们的恋爱》第二季：官宣郑爽 加盟，爽爸现场给女儿加油助威。　　拥有雄厚实力的龙帮被三井选中，龙老大的爱徒达文秀、胡双南先后成为了日本人的扶植对象。在日本人的威逼利诱面前，达文秀以抗日民族大义为重，没有迷失自己，但是却不得不品尝与胡双南和武朝元这两个他最好的兄弟离心离德、反目成仇的苦涩结果，这种苦涩或许只有与从相识、相知到相爱的陆小青在一起时才能稍许冲淡。从江湖大哥、租界红人成长为响当当的抗日英雄，达文秀经历了悲壮却又富有传奇色彩的一生。Principle of Use: Repairing a building increases 2 points of skill, and multiple teams can be sent to repair it at the same time.胡老大色厉内荏道：你……竟敢不把我们少爷放在眼里？秦枫冷笑一声，也不与他争执。