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PS: In fact, I have seen all the design patterns a long time ago. However, I didn't write a blog, but I soon forgot it and didn't play any role. This time I summed it up in the form of a blog, and found that the effect was still obvious, because through this way of summarizing, I understood it more deeply, remembered it more firmly, and affected my thinking of realizing functions at ordinary times. Therefore, I encourage everyone to sort out what they have learned by taking notes, so that I believe they can understand it more deeply and better. I will write it down all the time and then plan to write a series of WCF articles.这是一个失败者逆袭成长的故事。大难常有小难不断的家家，跌跌撞撞活了二十多年，好不容易逃脱家乡，巴望在都市角落创业发挥之际，竟然遇上闺密合伙人的卷款背叛，只好躲回老家，却阴错阳差代父出马竞逐地方选举，造就这场荒诞、有趣，励志感人的青年返乡奇幻之旅。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.抗战期间，日寇成立汉奸武装，对抗日根据地进行蚕食、破坏和袭扰并暗杀我地方干部。一天，在迎亲的队伍中，化妆的日伪军杀害我方骨干队员，引起强烈民愤。为严惩汉奸暴行，一支叱咤风云的敌后便衣队从此活跃在淮北大地上，在执行反特锄奸，敌后侦察，拔除据点，内线策反，武装打击日伪土顽势力，深入敌营惩办叛徒恶霸匪首等特殊而艰巨的任务过程中，大队长陈忠华老成持重，政委贺兰刚柔相济，关涛刚烈勇猛而内心情感丰富，不同个性的新四军战士组成了一个威震敌胆的英雄群体，成为一群红色传奇人物。