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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.《9号秘事》是一部英式黑色幽默悬疑喜剧。一部只有短短的几集，每一集都讲一个独立的故事。每一集只有短短的半个小时，却以十分紧凑的剧情和片尾的意外结局让观众大为赞赏。For accelerated taxiing before takeoff, pressing the PAGE UP key will accelerate (just press it), whereas PAGE DOWN will slow down.共尉就这样失望地离开了，云青山没有阻拦他，也没有欢送他，一切都很平静。本剧以影视语言再现战国，除了展现历史流程，历史人物，历史事件外，更重要的是要极尽所能去探究一点点极其珍贵的历史文化意蕴，发掘与张扬民族历史上曾有过的能激发民气的精神酵素，寻找与呼唤一种已多有失落的国气、民气与人气，从战国文化中汲取一点于今有益的原始活力，振发和强化民族精神。函谷关则不一样，他们直接面对的是项羽率领的几十万诸侯联军。