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The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.　　在腹背受敌的情况下，生性风流的少龙也纠缠上一段复杂的四角恋爱关系。到底少龙能否协助嬴政赢得天下呢？他会如何处理自己与隔世恋人的情缘呢？In general, JS is written as follows整剧配色都很复古经典！服装设计时尚耐看！选兼具爵士和流行的巴西-巴萨迷情的演绎。女孩们又回到了第二个系列节目中，在北爱不稳定的和平进程的背景下，用他们所有的老把戏来引导父母、派对、爱情兴趣和学校。It is precisely because the seriousness of learning this matter belongs to education in a broad sense that the cost of making content is very high. From the syllabus to the courseware to the final presentation form, many adjustments and corrections need to be made.