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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.在上海一条不起眼的小弄堂里，有一家只在深夜营业的小餐馆，老板是一位50岁左右的大叔，他会为每一个到访的食客做一份只属于他（她）的食物，一碗饭一个故事，一碟菜一段人生，暖心抚慰都市夜归人。众将正要吵着闹着请战，却被范增阻止了，只听范亚父道：老夫以为攻击甬道，还是东来和吕臣将军前往。CurrentSection: The time-date data segment where the current input cursor is located, which is the enumeration type QDateTimeEdit:: Section. When QDateTimeEdit displays date and time data, it is divided into several segments. Click the up and down buttons on the right side of the edit box to modify the value of the current segment. If the input cursor is in the YearSection section, the value of "Year" is modified.When I think about this matter again, I feel that he is lucky in the real misfortune. He is more deadly than Jiang Yong in the position where he was splashed. However, due to the self-help measures taken and the help of some people, he was lucky enough not to be seriously injured in the end.