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The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.A man who told me to be a mature adult虽然齐王是田市，可是因为他刚开始年轻，大权全部掌握子啊叔叔田荣的手里。长桥卧波，未云何龙？复道行空，不霁何虹？高低冥迷，不知西东……周青突然背诵起中学时代学过的《阿房宫赋》。I follow the execution process of this small program: first, I take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to result, and print it out. This just verifies our thinking at the beginning.李东旭饰演韩国最顶尖line tour旅行社社长的独生子智旭，并与财团的女儿世景订婚，是一个让人羡慕的完美男人。智旭有着傲人的外貌，数不清的财富以及父亲一手创办的大企业，但是他却觉得这一切了无生趣。他小时候因拼命工作的父亲受到很大的伤害，所以从不打开心门。但是，当他认识了在line tour工作10年却要离开的女社员李妍在后，生活发生了180度变化。He Yihe was born in 1996 and just turned 20. He joined the team of the Experience Museum in May 2015, two and a half years after Huang Weiping and Ding Rui put forward the idea of "life education".