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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).“我的恋爱经历是……”的舞台是咲和纮一住的公寓的一个上面的房间。为了专心治疗不孕而成为专职主妇的34岁宇治田希惠，虽然认真地勤勉地生活着，但是某天发现了丈夫的不伦。狂怒的希惠进入了婚外恋对象的房间，但在那里的不是对方的女性，而是那个男朋友加贺谷健太。希惠告诉健太“在丈夫回来之前我不会离开这里”。就这样，两人分别被劈腿后开始了奇妙的同居生活。是一对坚强的母女积极面对挫折最终重获新生的励志情感故事。出身富裕家庭的林舒不顾父母的反对嫁给了平凡的张扬，这段婚姻很快随着林家公司的危机破灭，张扬在林舒最艰难的时候背叛婚姻，两人离婚。5年后，林舒凭借自己的努力从一个小职员打拼成为了酒店宣传部门的经理，并与摄影师江向晨有了新恋情。母亲李晴为了不拖累女儿准备和初恋邓明觉再婚。母女俩正想展开新生活之时，张扬回国，此时的他已成为邓明觉的女婿，为了隐瞒自己的过去，想尽办法逼迫林舒和李晴离开。林舒和李晴在各自的生活中备受折磨，然而无论面对多么艰难的困境，林舒和李晴母女俩都始终坚强面对，最终通过自己的努力和真情赢得了幸福美满的第二次人生。美国的华盛顿州发生了一起严重的事故：一架飞机在起飞后迅速坠毁，飞机上的几百名乘客几乎全部遇难……但蹊跷的是，有5名乘客奇迹般的生还，而且只受了一些不太严重的伤害。这5名乘客即是被上帝眷顾的幸运儿，更是这次大事故里的焦点人物，于是乎，不但受到了航空公司全方位的照顾，更为他们聘请了一位心理治疗师克莱尔（安妮·海瑟薇饰），开导他们的心情以便于尽快走出事故的阴影。 　　FOX宣布续订《哥谭》第四季。