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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.This summer vacation, I took part in the "Social Practice Activities for College Students to Go to the Countryside in Summer" organized by the School of Urban Management of Hunan City University. In order to let students better master professional knowledge, Carry forward patriotic enthusiasm, serve the society and the people attentively, let students have all-round contact, understand the situation of poor areas in society and personality, and through investigation, find out the actual problems existing in the area, analyze and make solutions, and experience and comprehend from them to enhance the sense of mission of college students. In order to cultivate good social adaptation potential and strive to train oneself to become a contemporary college student who is beneficial to the society and the people, Secretary Liu Hui, Secretary of the General Party Branch of the Institute of Urban Management, was arranged to be our leading teacher. Under the form of building a new socialist countryside in the whole country, the theme of our activity is "serving the new countryside and building a new home."(3) Position 149秦国，能给予怎样的帮助呢？尹旭对此颇为好奇。为了适应秋名的路况，高桥将爱车FC3S的马力从340调到260，以取得性能上的平衡。宿命之战正式开锣，传奇对决拉开帷幕……Finally, I would like to quote an explanation on the principle of IQOS:先帝之孙岂止他一个？二十年前，宁王就输给了皇上，此乃天命。