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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.Germany is the hometown of T-Mobile. As the largest mobile phone operator, it has 2.67 million users (March 2004), closely following rival Vodafone. In order to upgrade Germany's highly profitable GSM network to UMTS third generation mobile communication standard and meet the demand of mobile phone Internet access, Deutsche Telekom obtained the authorization to use 3G in Germany in August 2000, and T-Mobile spent 16 billion German marks (7.6 billion US dollars). T-Mobile USA was formerly VoiceStream (which has acquired wireless operators PowerTel, Aerial and Omnipoint). VoiceStream was acquired by Deutsche Telekom in May 2001 for billion. Headquartered in Bellevue, Washington, T-Mobile USA is the third largest operator in the U.S. Market and the second fastest growing company after Verizon Wireless with more than 1.6 million subscribers, with an average quarterly growth of 1 million subscribers. It is also the only mobile phone company that uses a unified brand in Europe and the United States. Connected to Deutsche Telekom through an international roaming agreement and compatible with other GSM networks, T-Mobile USA provides more coverage worldwide than any other U.S. Wireless operator. In 2004, T-Mo徐正溪新剧名叫《嫣语赋》，很古典很好听的名字，搭档女主乔欣，腾讯古装剧，6月下旬开机，聚禾影画公司出品。俊男美女，希望造型好看些，拍出让人耳目一新的古装剧。In an interview with Kaggle, he shared his experience in participating in the competition and also talked about many combat experiences in machine learning competitions. Quantum bits are transported here. The following is the translation of the interview:Console.WriteLine (sender);正在发愁李左车的事情如何处理，没想到赵王歇如此配合，将偌大的赵国拱手送上的时候，还要将麾下大将彻底地推给自己，当真是盛情难却啊。