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In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).空手接箭是可以博一搏的，弹丸还是算了。本剧与《半路夫妻》、《亲兄热弟》合称为“亲情三部曲”。她原本和最好的朋友Boo合伙在伦敦经营着一家咖啡厅，然而她的生活因好朋友的意外去世而发生变化。Fleabag的伦敦生活非常不如人意：和姐姐Claire（茜安·克利福德 Sian Clifford 饰）的关系疏远；爸爸选择和继母生活而忽视女儿；男朋友又一次提出分手；最让她难受的是，现在的生活看似早已恢复正常，但是昔日好朋友的身影时常闪现。往日和如今的场景相互交叠，暗涌的情绪找不到适当的宣泄口，Fleabag伦敦生活的走向会是如何……项羽对此也是乐见其成的，自然项梁死后他便对秦国人恨之入骨，新安杀降也有这方面的原因。　　而华仔也跟故事中真有其人的主人翁Roger碰面，谈及桃姐的一些往事，让他更易将角色揣摩。东方影视大学表演系2000本科班即将毕业了最后几个月中这个班师生们将一同完成一出毕业大戏排演和汇报演出这将四年来全部教学与实践最终检阅意义非凡！带班老师安然为此费尽心血、伤透脑筋选择什么样剧本才能让尽量多孩子们都有角色演呢？如何才能既公平又“人尽其才”地分配好主、配角角色对每一个学生都有所交代？这份“沉甸甸”演出角色分配表一时间成了一份神秘而又难以最终决定“安然名单”……排练课上安然公布了“名单”草案学生们一下炸开了锅！一直没戏演的吴思、林海平被分配了重要角色，而只拍过几个广告艾彤则被定成了女一号。大家议论纷纷沉不住气，小刚忿忿不平地闹到了系办公室里眼看事情闹大系副主任，颜歌找到了安然谈话而顶着压力安然默默坚持了自己选择。就此时某著名导演突然为了筹备自己新片来影视大学挑选演员而令大家大出意料导演竟然一眼就看上了吴思！吴思陷入了极大矛盾与困惑……