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He said the problem was that he forgot to disable recursive queries on the server, which made his server a tool used by DNS amplification attacks. He explained: "DNS servers can be configured in one of two basic ways. In one possible configuration, the DNS server only provides domain name services (imperative) for the objects it is responsible for serving. In another configuration, in addition to providing those domain name services, the DNS server also searches for any domain (recursively) on the wider Internet that it was not authorized to manage. It is the recursive DNS server that enables the Internet to operate normally. They are also a way of attack. "板栗也看出了他的心思，那傲慢施恩的模样，哪里是交结，真要走近了，只怕往后就把他们当跟班使唤了，还不知怎样予取予求呢。必须等回京后，让父母出面，并请一位合适的人上周家提亲，才合乎礼仪。The seven-layer model of OSI and its description are as follows:外星机器入侵地球，掠夺地球自然资源，无情的屠杀居民，人类数量急剧减少，在一个偏远的乡村，饥饿的人们已经变得和外星机器一样危险，一个19岁的女孩莎拉·康诺利，绝望的与一群试图摧毁她父母农场的土匪对抗……　 由好莱坞著名导演刘易斯·迈尔斯通执导的经典反战题材影片《西线无战事》，改编自德国作家雷马克的同名小说。这部堪称电影史上“最伟大的反战电影”之一的影片，一举荣获1930年第3届奥斯卡金像奖最佳影片、最佳导演和最佳编剧提名。导演用简明精练的镜头再现了惨绝人寰的战争实况，也以细腻流畅的手法写活了保罗爱国迷梦的幻灭。影片结尾处保罗捉蝴蝶被子弹击中的镜头，已成为电影史上的经典瞬间。板栗之前还让人回去搬了坛酒来，因此大家边吃边喝，惬意的很。