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A1.1. 6 Reflex check.In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.反抗运动将凯特尼斯卷入了漩涡，她被迫成为棋子，她被迫为许多人的使命负责，不得不肩负起改变帕纳姆国的未来的负责。为了做到这一切，她必须抛却愤怒和不信任，她必须要成为反抗者的嘲笑鸟――不管要付出多大的代价。　　曹患刚灭，李自成又率起义军直逼京师，崇祯欲用长平公主远交近攻之策对付李自成。为应对清廷开出的皇族出使才能和谈的条件长平公主与周世显（刘松仁）假意成婚。周世显出使清廷，不料成功回来之日方知京城已被乱兵所破，崇祯自缢煤郑氏跟嫂子刘氏相视一笑。郑氏听了觉得奇异，把荷包要了去，掏出那个木雕查看。