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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 fully shows that the classification ability is closely related to the existing knowledge.The same sequence of events generated after the finger touches the screen is a click event.(1) Cancer is a chronic disease and will not die at once.这两艘船，满载着对汪直友谊的诚意，以及对某人深深的恶意。斯班赛（道恩·强森 Dwayne Johnson 饰）曾经是一名在赛场上叱咤风云的橄榄球明星，如今，已经退役的他必须忘记往日的那些令他热血沸腾的“峥嵘岁月”，并且尝试着在橄榄球队理财经理这个职位上找到人生新的方向和意义。张时彻同时下令城头铳手开火。