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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.该剧主要讲述了性格极为冷酷的企业并购专家，在接受心脏移植手术后，性格逐渐变得温和，并在与命定恋人相处之后，学会爱与幸福的故事。有一天突然被召唤到人间。怎么？你将来想过皇帝瘾么？……裕王落座，诚惶诚恐望向众臣。Two implementation classes:　　《天空之城》以美丽的西双版纳的热带雨林为背景，讲述了发生在澜沧江边的美丽爱情故事。载淞之女永恩自幼与督军沈详之子其峻订婚。载淞与发妻郁芩失和，郁芩与唐济出走。其峻留学归来欲解除婚约，途中巧遇永恩，一见倾心。永恩受继母虐待投奔管家周全。她结识男子来福，两人相恋。来福系唐济长子庭轩的双胞胎兄弟，庭亮为了争夺财产，设计杀害庭轩，却误将来福当成庭轩杀害。永恩不知来福已死，错把庭轩当成来福，却发现他将自己视为陌路。永恩进入唐家探询究竟，庭轩不知不觉爱上了永恩。永恩知道庭轩不是来福后离开唐家。其峻一直默默守护她。庭亮揭穿庭轩并非唐济亲生，庭轩被赶出唐家，其生母也被庭亮杀害。忍无可忍的庭轩一心想复仇。他与宜岚结婚，想借助宋家财势夺回唐家财产。庭轩思念永恩，怎奈永恩与其峻共结连理。庭轩掳走永恩将其软禁，永恩誓死不从，其峻赶来相救。生死攸关之际，庭轩改过，成全了大家。