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Episode 20In 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.218. X.X.101Deployment/retraction landing gear G G only works if the landing gear of the current aircraft is retractable.不少啊。先婚后爱，一个错误的新闻报道使男主与女主相识并成了一对欢喜冤家，无意中女主又发现被男主一家对外称去逝的男主的妈妈其实在一家精神病医院，在男主妈妈的威逼下男主与女主结了婚并引来了一连串啼笑皆非的故事。