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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.D (sender, e);《地球脉动》创剧人倾情打造的《我们的星球》采用令人惊艳的摄影和技术，采用前所未有的摄影方式探索了地球上尚存的野生区域和那里的动物。秦旷诧异道：怎么就走了？把眼睛望着香荽。Events replace the work that could only be performed by the scheduled tasks of the operating system, and MySQL's event scheduler can be accurate to one task per second, while the scheduled tasks of the operating system (such as CRON under Linux or task planning under Windows) can only be accurate to one task per minute.We can also use the javascript callback function as follows:山寨《三国大传》剧组来到某三国景区拍摄，饰演貂蝉的颜欣儿与董制片关系特殊，介绍自己前男友郭子嘉饰演张飞；介绍自己闺蜜肖晨晨饰演小乔。景区赞助资金到帐后，剧组人马在一夜间消失，只剩下还在睡梦里饰演张飞和小乔的这两个演员。由于剧组还拖欠景区小青客栈二十多万的食宿费用，同时景区负责人曹总认为这是在给景区抹黑，紧急决定严密封锁消息，并积极寻找另外投资方复拍三国。为假戏真做，曹总规定他们两个演员一直要穿上戏装，并要求大家一律按角色名字称呼他们，一场啼笑皆非的空城计上演了。