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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.纣王朝思慕想女娲美色，无心朝政。奸臣费仲恰好投其所好荐亲外甥女苏妲己进宫邀宠。可妲己早与西伯侯之子伯邑考定有婚约，两人深情相爱。苏护抗旨，纣王发兵强夺。妲己为顾全大局保全全城军民性命，割情舍爱，甘愿入宫。西周势力日渐强大，姜子牙联合崇黑虎里应外合，诛了奸侯虎父子，把北伯侯王位交还崇黑虎。此后文王病重，托孤姜子牙，姜子牙立姬为武王，扶植武王抗击殷商多次武装入侵……恰在这时，一辆深蓝绸布车从身后过来，车帘微掀，里面的人探头对他们这群人张望。《上海滩喋血枭雄》:1937年淞沪会战打响之际,上海的法租界依旧在炮火轰鸣声中歌舞升平.进步青年许念东(连奕名)来上海与他的生死之交顾立铭(林保怡)会合,同时在船上执行刺杀汉奸曹振武的任务.眼见刺杀成功,他们的计划却因年轻女学生林在云的意外介入被打乱,两人被裹挟进多方势力的各种角斗中,人生发生巨大转折.最后在中共党组织的正确引导下,许念东,林在云组织暴动,携带用黄金换来的军火和医药投奔新四军。　　四个女人，普通的咖啡厅老板、精神科医师、高中教师、律师事务长，还有一连串的杀人事件……　　没有人进去，也没有人出来。尹旭旋即又递上一把环首刀，说道：看看，这是诸先生打造的样品，还有待提高。