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The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.《那个年代》是以上世纪80年代末至上世纪90年代初深圳作为改革开放沿海城市的变化为大背景的都市情感剧，着力勾画深圳股市诞生的曲折历程。该剧最大的看点就是选取了证券市场发展鲜为人知的一段故事作为切入点，从而唤起观众对那段历史的回忆。该剧讲述了改革开放初期那个年代，一群年轻人怀着远大理想来到深圳开创事业，收获爱情的故事。罗震中复员回到家乡，接到在深圳的战友周元龙的来信，他推迟与未婚妻余莉结婚，踌躇满志地奔向深圳。途中他见义勇为，使大学生雷雪冰免遭盗窃，雷对他产生好感。刚到深圳的他遇到种种不顺，接着四处寻找工作，期间遇上了陈家兴等一群同样怀揣梦想的年轻人。他们凭着拼搏精神，白手起家，艰苦创业，最终成为优秀的企业家，拓展了自己事业的一片天空，也为深圳初期建设作出了贡献，实现了人生价值。微微愣神之后才反应过来，是和自己一道前来九江国，还被自己羞辱过的那个汉国使臣。For example, if we want to implement a JS function, Such as form validation, Then if we don't use the policy pattern in javascript described in the previous chapter to solve the form validation encapsulation code, It is a temporary form validation function written by itself. Certainly without any encapsulation, Then at this time, we will pop up a prompt to the user for whether the two values are equal. If there is a form verification on another page, their judgment method and business logic are basically the same, but the comparison parameters are different. Should we consider writing a form verification code again? So now we can consider using the template method pattern to solve this problem. Common methods are extracted, and different methods are implemented by specific subclasses. This design code also has the advantages of stronger scalability and better code ~黄斌见这状况，只好放弃劝说了。看《绝代双骄》从来不会缺少惊喜和震撼，但是这次的震撼，也太大了一点吧。Alice arrives unannounced at her estranged brother Ethan's house in an attempt to reconcile, but bizarre visions, the return of his strange girlfriend and Alice's paranoia and suspicion force the siblings to cling onto reality amidst mysterious circumstances.