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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).总是遇到渣男的她在爱情的道路上一再磕磕碰碰，女友出轨，男友劈腿，还被迫做了别人的小三，是我给你自由过了火，是她过于敏感吗，还是真爱还未降临身边？强敌们》是韩国第一部以青瓦台总统府为故事发生背景的电视剧，该剧主要讲述了青瓦台内警卫们的生活和爱情，蔡琳将在剧中饰演韩国第一位女总统保镖。去年，蔡琳通过《达子的春天》重返娱乐圈，离婚后的蔡琳迎来了演艺事业上的新高峰。如今时隔一年，蔡琳将携手李宗赫和李真旭共同演绎《强敌们》，在此之前，李真旭曾经出演过《某一天》、《空城》和《BEFORE&AFTER整形外科》等热播韩剧，而李宗赫主演的电影《RADIO DAYS》将在近期上映。在《强敌们》中，李真旭将饰演总统的儿子，而李宗赫则将饰演一开始很瞧不起蔡琳的同事。在海报中，女警卫蔡琳持枪出镜，英姿飒爽，干练清纯。蔡琳说，出道这么多年，她还是第一次拿起真枪，感觉十分激动。Creative mode真以为我是傻子？何薇不自觉的后退一步，眼眸中闪过一丝错乱，紧紧咬着自己的嘴唇，楚楚可怜，看似受了很大的委屈。Jin Zhengxun《司祭》描述了2018年在南部天主教医院发生的超现实现象中，相信神的驱魔司祭和崇尚科学的医生携手合作，一起守护珍贵的生命。