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1. What is the difference and connection between denial of service attack and distributed denial of service attack?For example, in Java, the Selector's select () method is used to implement this synchronous blocking operation waiting for an event to occur. In the implementation of select () under Linux operating system, a) will call epollCtl (epfd, opcode, fd, events) to register the events that have been registered in Initiation Dispatcher into Linux system, where fd means Handle and events means Handle events that we are interested in; B) Synchronize the occurrence of a blocked wait registered event by calling the epollWait method. Events on different event sources may occur at the same time. Once an event is triggered, the epollWait method will return. C) Finally, find the associated SelectorKeyImpl object by the event that occurred, set the event that occurred to the ready state, and then put the SelectorKeyImpl into the selectedSet. In this way, we can get the event-ready SelectorKeyImpl collection through the Selector.selectedKeys () method.城市小白领刘贝感情不太顺利，她一肚子怨气都放在了背叛者阿东身上。这天她喝的烂醉，策划报复阿东。然而还没来及做任何行动，自己却被一个同样感情受伤失意的中年男人绑架了。 在一个封闭的房间里，绑架者与被绑架者开始了心理交锋。 绑架者为满足自己报复女性的变态心理，想尽一切办法摧残女孩的身心。而女孩经受折磨之后，意识到人被仇恨蒙蔽了双眼是多么可怕，心灵反而超脱。 而此时，绑架者智商低下的傻弟弟意外出现在现场，让刘贝看到一丝逃脱的可能… 之后，刘贝的闺蜜意外卷入，警察也闻风而来，好人和坏人，聪明人和傻瓜，当事人和旁观者…每个人都带着几种不同的标签，开始了一场错综复杂的较量…1938年春，一架日军战斗机迫降鲁西南山地，掌握重要军事机密的日本间谍桥本隆一潜逃。由李剑带领的利箭特战队奉命抓获桥本隆一，并从桥本的口中获得重要情报，即日军目标徐州，欲占据霍山城为大后方，进而发动徐州战役。李剑及利箭特战队作为先遣部队，挺进霍山城，执行代号为“纵横”的特别任务。利箭特战队在淮北小镇遇上杂耍艺人王大力和龙方，众人一同火烧皇协军军营，擒住土匪，智取皇协军武器，成功占领霍山城。之后与鲁西南八路军刘团长部队及林筱雨领导的霍山城游击队会合，大败赵家圩子保安队和霍山城驻守日军部队，坚守霍山城。南京76号特工所特派员张怡梅潜入赵家圩子，秘密联合赵家集，策反土匪，惹出不少事端。李剑等人一次次化解危机，并联合土匪黄占魁，神枪手虎子等人解放赵家集。利箭特战队顺利完成任务，彻底粉碎了日军阴谋，稳固皖西南，建立根据地，迎接纵队司令员率主力部队的到来。1998年7月，香港新机场启用前十天，恐怖组织悄悄潜入香港……　　本剧就是讲述独身主义的主人公，最终怎样走向结婚的道路。当初就是这把蠢断送了前主人的xìng命，就会让自己丢了xìng命……这份仇恨他一直都藏在心里，今日总算是有机会了，心中暗下决心必须要斩杀尹旭，一雷前耻。