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The essence of the mirror server mentioned in the previous section is to build a miniature CDN by itself. The same is true behind the high-security IP provided by major cloud service providers: the website domain name points to the high-security IP, which provides a buffer layer to clean traffic and cache the content of the source server.公元2110年，能源即将耗尽的地球满目疮痍，全人类面临灭顶之灾。千钧一发之际，一群勇敢的赛尔智能机器人登上赛尔号飞船，临危受命前往浩瀚宇宙寻找无尽能源。　　在前往金沙谷的途中，夏梦看见了一张刀疤脸，受到惊吓，更莫名其妙被一辆越野车撞翻，险些丧命，接着常在又跌落陷阱里，幸得一个叫郑大林（谭耀文 饰）的年轻人相救。0-2;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.范家嫡长子娶亲可是一件大事，前两年一直没有合适的人选，所以这事情也耽搁先下来了。　　张奕错过了答辩，又因为在一个月前帮同学徐超和别人打架，学校不给发放毕业证。