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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.这是一个和婚外恋有关的故事。在文中，男主角很少露面，他不是很突然地露了面，就是很困难地露上一面。我们只知道他已婚，有一个孩子，其余的情报，一概没有。女主角这儿，却受尽了相思之苦，爱得缠绵而悲哀――遭遇爱情袭击，毫无防备，面临最困难的婚外恋。爱来的时候很美很轻巧，落下来却是一生承受不起的重量。女主角的要求很简单，只求能再见男主角一面。这看似简单的要求，男主角却做不到。他的回应大大出乎意料，甚至于非常残酷――他切断一切联系，再也不接女主角的电话。于是，女主角这儿就有无尽的凄 风苦雨了，一段段、一行行，写得整个BBS的玫瑰园里满是眼泪。对“无情”的男主角，女主角却始终不变地维护着、牵挂着、思恋着……曾经衷心服务于人类，堪称文明最高代表的赛昂智能机器人，其所引发的叛乱难以想象。第一次赛昂战争战后的第十年，自幼立志报效国家的热血青年威廉·阿达玛（卢克·帕斯夸尼洛 Luke Pasqualino 饰）以优异且令人叹服的成绩顺利自空军学院毕业。他踌躇满志登上雄伟壮观的卡拉狄加，然而却并未如愿驾驶性能卓越的战机，反而被派去驾驶老旧笨重的货物运输机。他的直属上司库克·法斯乔维克（本·考顿 Ben Cotton 饰）身心疲惫，可望尽早退休。这对格格不入的搭档很快接到命令，即将前往天蝎座执行一项货运任务，与之同行的还有肩负神秘使命的贝卡·凯利博士（Lili Bordán 饰）。When many salesmen start to do business, they are often very energetic. They don't know what to do when they find customers, send samples and quote prices. They often lose all their achievements. In fact, you should keep asking him, when will your order come down, and keep asking him until there is a result. In fact, purchasing is waiting for us to ask him, just like a child does not cry, how do we know he is hungry?　　很多年前，银河系另一端的两颗行星被黑洞所吞噬，两个尚在襁褓中的外星孩子乘坐飞行器来到地球。拥有超能力的他们在截然不同的环境中长大，也造就了各自不同的性格和人生走向。长大后，仪表堂堂、正气凌然的成为了保卫城市和平的城市超人（布莱德·彼特 Brad Pitt 配音），而相貌猥琐、蓝皮大头的则化身破坏人民安康的大坏蛋麦克迈（威尔·法瑞尔 Will Ferrell 配音）。他们终日争斗，战争不断。城市超人博物馆开幕当天，麦克迈成功越狱，并劫持了美丽的女主播罗珊（蒂娜·费 Tina Fey 配音）。在天文台的终极决战中，麦克迈成功击败多年的老对手，完全统治了这座城市。In order to prepare a zero-based environment, we will empty the rules provided by default in centos6 so that we can carry out experiments and use the iptables-F INPUT command to empty the rules in the INPUT chain of the filter table. Later, we will summarize the relevant commands for clearing the rules separately, and there is no need to struggle with this command here.