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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. 　CBS已续订《夏威夷特勤组》第七季。此剧讲述四个正处于七顚八起状态的年轻人在职场上奋斗，和与他们家人之间相处的故事。芭蕾舞演员艾美（王兮 饰）与喵喵（宋紫菲 饰）是舞蹈学院校友，她们亲密无间；舞美师刘小海（贾之海 饰）与歌手辛磊（李鹤 饰）是她们共同的朋友：在感情上，四人关系有些复杂，艾美在追求者辛磊与刘小海之间摇摆不定，而刘小海和喵喵却曾经有过一段不可告人的“地下情”。电视剧《家家有本难念的经》，是一部描写皇城宝地北京普通市民生活的，既有独立性而又有连续性的风俗喜剧。它的内容包括反映调动工作之难的《刀下留情》；反映住房难的《三顾危庐》；反映六害危及少儿身心健康的《少儿不宜》；反映老年人退休生活的《徒劳有益》等。镜头无一不是对准了生活在现时代不同市民喜、怒、爱、乐和恩恩怨怨。