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In the process of DNS resolution, the client initiates a query request, and the DNS server may need to make additional queries to complete the resolution process and give a response, which will consume certain computing and network resources. If an attacker uses a large number of controlled hosts to continuously send resolution requests for different domain names, the cache of the DNS server will be continuously refreshed, and the failure of a large number of resolution requests to hit the cache will cause the DNS server to consume additional resources for iterative queries, which will greatly increase the resource consumption of the DNS server.秦始皇要一统三界，凌驾于仙神之上。　　《公元1921》，讲述的是中国共产党成立的过程。断章取义，说的好啊……杨长帆这便召集治下匠人首领，将打油诗与口号传递下去，石碑篆字，横幅大写，务必要将这样的精神尽快渗透到彼岸。For substrates such as Caijing, Mame2003 can be basically used for simulation. For ROM that cannot run, FBA2016 can also be tried for simulation.