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When the SYN gateway receives the SYN packet from the client, it directly forwards it to the server. After receiving the SYN/ACK packet from the server, the SYN gateway forwards the packet to the client and sends the ACK confirmation packet to the server in the name of the client. At this time, the server enters the connected state from the semi-connected state. When the client confirms the arrival of the packet, it forwards if there is data, otherwise it discards it. In fact, the server has a connection queue in addition to maintaining the semi-connection queue. If SYN attack occurs, the number of connection queues will increase, but the number of connections that the general server can withstand is much larger than the number of semi-connections, so this method can effectively reduce the attack on the server.Probability Theory: This one is not specially recommended, because it is not very good at learning, so it is misleading not to make recommendations. No matter what books you read, you just need to master the key knowledge. Can't ask Bayes when the time comes, you don't even know how to push it = =!《芝加哥医院》是《芝加哥烈焰》（Chicago Fire）的第二部衍生剧，故事描述芝加哥城中最繁忙的一家医院的日常工作——这里有一支勇敢无惧的医护团队，他们团结一致，敢于面对任何风险。每当特定事件（灾难）中的病人需要救治，或者遇到别的医生束手无策的疑难杂症，就轮到他们上场了。与此同时，他们在混乱的急诊室里培养出紧密的关系并一起渡过难关。根据NBC的构想，该剧和《芝加哥烈焰》、《芝加哥警署》将经常交换角色和情节，使三个团队（三部剧集）有机地融和在一起。Yaya DaCosta扮演长相迷人的住院护士Maggie Seaver，是《芝加哥烈焰》核心角色Kelly（Taylor Kinney）的新女友。事实上，他们高中时代就曾是一对恋人，但Kelly在某件事上一直亏欠她。当然，他们都经历了一段艰难岁月，因此一开始他们的关系只是单纯的友情。Severide很高兴能再见到她并与她坐下来好好谈心。　　其后，单云发现伍德仍然和那个女人及其孩子来往，回家后又发现伍德对网名为“胡大仙”的女人无微不至的关怀，素有洁癖的单云走到绝望的边缘，甚至有自杀之念。在恍惚中，来到他们新婚时曾居住过的幸福小房子。闺女跟自己不一样，将来也不知会嫁什么样的人家，还是先练习一番才好。十一岁的小男孩杰西·阿龙斯(乔什·哈切森)一直梦想能成为学校中跑得最快的学生，正当他赢得了年级里的田径冠军之时，一个叫莱斯莉·巴克(安娜·索菲娅·罗伯)的小女孩突然地出现，成了他在田径场上的劲敌。