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《芝加哥警察局》演绎情报科打击贩毒和侦破案件之余，将主要成员在警局内外所面临的种种向我们娓娓道来，在新一季中继续深入展现这些蓝衣卫士的一线生活。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.出身警察世家的尹平安为人懒散，他的兄弟尹明扬是警界神枪手，夺“金枪”之誉，却不幸在一次追捕黑社会两大集团的混战中中枪惨死，明扬之友方正右手受伤致残，后其苦练左手，终回复当年枪法，并暗中追查杀害明扬之凶手。Start computer finished!冷子峰原为拳击界冉冉升起的新星，却在遇见了出身击剑世家的赵伊虹之后，改变了人生的方向。为了实现击剑梦想，两人一起加入了击剑强校震宇学院。起初，新手子峰和没有天份的伊虹一度在队伍里垫底。为了得到主将的肯定，两人互相扶持，努力克服了严苛地训练。冷子峰成为了最具潜力的击剑黑马，而赵伊虹成为了百战百胜的战略智囊。正当两人准备携手进入国家集训队，立志为国争光之时，意外地牵扯出二十年前的恩怨。原来冷子峰的父亲也曾是击剑国手，却被赵伊虹的父亲挟私怨所伤，黯然退出击剑界，隐姓埋名至今。国际赛上，强敌压境，在国家荣誉面前，两人最终放下了芥蒂，携手全力拼搏，为国家荣誉而战，也为彼此的真心而战。