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3. The third handshake: the client receives the SYN + ACK message segment from the server. Then the Acknowledge Number is set to y+1, and the ACK message segment is sent to the server. After the message segment is sent, both the client and the server enter the ESTABLISHED state, completing the TCP three-time handshake.该剧故事发生的年代为明崇祯十七年、清顺元年(即公元1644年)，至南明永历十六年，清康熙元年(即公元1662年)。李自成进北京逼崇祯皇帝煤山自缢，吴三桂为报家伊引清兵入关，清军长驱直入，明王朝因此危亡。李自成称大顺皇帝，张献忠称大西帝,顺治在多尔衮孝庄进京后称帝,在这特殊时期里,谁主沉浮？剧情由此展开.旁边一个仆人同样严肃的看着那些鸡翅膀，然后关切的问道：少爷，一碟酱油够不够？哈哈……咳……咳咳咳……吴琳琳认真的看着电影，却突然被尹文倩笑声、咳嗽声混杂的诡异声音打断。刘家婆媳们都松了口气，欣慰地看着香荽。众人以为他刚醒过来，看见白影心中害怕，这才叫喊，黑暗中根本不知他又晕过去了。Step 1: Find a vulnerable host on the Internet and install a backdoor program on it after entering the system. The more hosts an attacker invades, the stronger his attack team will be.