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How should we defend against this attack? First of all, as users, we try our best to download APP from regular channels and surf the Internet in a civilized manner, and try our best not to make broilers. Secondly, as a service manufacturer, when the server is attacked by DDoS, we try our best to improve the processing capacity of the server. When the processing capacity of our server is greater than that of the attacker, these attacks are nothing to the server. Finally, under normal circumstances, the processing capacity of our server is generally lower than that of the attacker. In view of this situation, there are currently the following methods: 1. Violent methods, such as setting an access frequency threshold, and rejecting when the number of accesses per IP unit time exceeds this threshold; For a certain service, if the instantaneous request is too large, choose to directly refuse to ensure the normal operation of other services; This method may result in normal users not being able to use it. 2. Verification code. In order to prevent normal users from being injured by exposure methods, at present, service providers will send verification codes to "users" when receiving a large number of requests. If it is a real user, it will input verification codes, but if it is a broiler, it will not. Through this method, the real user and the broiler will be distinguished.故事讲述洛杉矶出现了神秘巨大天坑,一个家庭也由此被一分为二,母亲&儿子与父亲&女儿被迫分离。当一部分家庭发现自己和一群形形色色的陌生人一起身处在一个无法解释的原始世界时,他们必须努力求生,并揭开自己身处何处,是否有回家的路的谜团。冈萨雷斯将饰演一名空军飞行员,他被招募来领导拯救落入天坑的人的任务。Although there are many exits at busy stations, I basically know where to go by looking at the map of the exits. For tourists, the most important thing is the elevator and escalator ~ this everyone don't have to worry about, every station has ~ just follow the instructions on the ceiling and wall, no problem!三就是多跑跑，正好当练兵了。冰雪女王弗雷亚（艾米莉·布朗特 Emily Blunt 饰）本性温柔善良，却因为痛失爱女的绝望而变得残暴和疯狂，她和邪恶的姐姐瑞文娜（查理兹·塞隆 Charlize Theron 饰）一起建立了寒冷彻骨的冰雪王国，利用冷酷和无情的规则维持她们的统治，更立下了不许相爱的规矩，违者将要受到可怕的惩罚。他和胖子商议了好一阵，也不得主意。Delete the rule according to the rule sequence number, delete the specified rule of the specified chain of the specified table, and the-D option means delete the rule in the corresponding chain.