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Completely crazy and ridiculousDDOS 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.都市报社主任郑雨晴人近中年，一心只想着提前过半退休的日子照顾女儿，没想到报社突发状况，她临危受命被任命为主编。郑雨晴到任后发现，报社中问题严重，变革也阻力重重。郑雨晴凭着自己的能力和一腔热血，用女性的柔婉、坚韧，终于让报社经营有了转机。但是新一波移动互联网浪潮又汹涌而来，使传统纸媒受到冲击，报社又面临着新的危机。在与女儿以及90后下属的相处中，郑雨晴渐渐明白，应该改变自己，尝试去学习新事物。郑雨晴开始了自己的蜕变，最终和团队一起走出了一片新天地All printed boards must be marked with the printed board number, the company logo, the design date and the manufacturer's production date (marked by year and week).小二听了玄武候一番话，顿时两眼发亮：行家呀。小葱道：咱们是不是得派人将德胜路流花巷那一家子看起来。When designing the PCB, the traveling direction of the production line should be considered. If the traveling direction of the PCB is X direction and its vertical direction is Y direction, X ≥ Y (referring to size) should be ensured.