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The utility model will be further described below with reference to the accompanying drawings.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.Nikita和Michael的关系一开始相对稳定，但随后发生了一些可怕的事情，令Michael面临巨大的考验——他和所有人的关系都变得紧张，这其中当然包括Nikita。而其他的人也有了各自的想法，第三季后半段组织将遭受重大考验AWB is white balance and has six selection functions, from left to right:故事讲及“宅男”与“富二代”的爱情故事。看着那渐渐走近的队伍，人群就沸腾起来，又是笑又是叫。1. When the user presses the HOME key.