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.
一家子可能要呆到过年，年后再回乡下。
严世藩不在，严嵩终究是个庸人，应付不了太多诡计，更无法立即组织有效反击。
The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:
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玉米这小子也察觉到爹娘爷奶神情不对劲，变乖巧了许多，不敢再动不动就吵闹。
Key Issues Faced by Online Organizations:
她忙道：我都跟你刘爷爷和刘三伯说好了，还拖啥？年前就把锦鲤接回去，团圆桌上增加一口人，这是多好的喜兆。
五个身世飘零的孤儿，因爱而齐聚一堂，虽无血缘，却情比金坚。
Zheng Haonan Spokesman: 650,000 Zhen Ni Spokesman Every Three Years: 500,000 Yuan per Year
尹旭点点头，轻声叹道：东来省的，吕将军所部战死沙场，却也破坏了秦军粮道，也算是居功至伟。
The weather outside today is amazing! Decided to go out and get some air hh [summary] socks
格斗的根本目的就是最快，最狠，最有效地击倒对手，经过长期训练，尹旭对此深以为然，所以不出手则已，一旦出手就要做到快、准、狠。
未观测的战略级魔法，将朝鲜半岛南端的军事都市及舰队消灭了。
不是小葱妆容化得不好，说起来，小葱的易容术最初还是他教的，他对小葱化妆的手法太熟悉了。
男人有些不耐烦，但还是打开文书再次翻看，这次只瞄准数字。
This article has been published by Netease Cloud Community authorized by author Lin Weihao (please do not reprint without permission). The original link: DDoS Attack and Defense: From Principle to Practice (Part I)
社会新鲜人小文（许茹芸 饰）与大学生千勇（范植伟 饰）邂逅于小文的台北租赁小屋，两人从陌生到同居，之后时有磕磕碰碰，都被居酒屋老板（吴建豪 饰）巧妙化解。音乐制作人关先生（朱孝天 饰）偶然发现小文弹钢琴的天赋，将其收到麾下，不久帮她发行演奏专辑。千勇多年专职学摄影，但成功路上障碍不断，特别是摄影高人中原（周渝民 饰）的出现，更令他产生严重的危机感。由于事业不顺，焦头烂额的千勇与小文发生严重的语言冲撞，导制千勇离开了同居小屋。背水一战的千勇励精图治，终于在业界崭露头脚，丘雪儿（天心 饰）和中原是青梅竹马的朋友，她有意无意间帮助刚刚起步的千勇。而此时的小文却陷入了事业的低谷，就在这时，她的前男友（言承旭 饰）回来了......
