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看到这里，沈飞也知道了所谓的天书就是天启写的书。So this ford's second attack isPublic void del (Observer observer);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.《唐顿庄园》第六季将是它的最后一季。此前，剧集的联合制作人盖瑞斯·尼姆在接受采访时就表示，该剧会在第六季后“随时剧终”，如今这一言论最终成为现实。 《唐顿庄园》从2010年开播至今，一直是英国观众非常喜爱的作品，但随着剧情拉长，收视率已经大不如前，这也是该剧选择剧终的其中一个原因，不过对于普遍偏短的英剧来说，《唐顿庄园》坚持到六季已经是个不小的规模了。 据报道，《唐顿庄园》的不少演员合约都只签到了第六季，并且有很多主创都已经开始准备投入新作品的创作中去了。尤其是编剧兼制作人朱利安·费罗斯，早在几年前就已经开始准备自己的NBC新剧《流金岁月》，但一直碍于《唐顿庄园》的续订而没能抽出身来，现在也能够全身心的投入到新剧的制作。