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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).2. As a Cheng Yuan who has been engaged in machine learning for more than two years, seeing the computer series you recommended also thinks it is very unreliable. I have read most of the books you recommended. In particular, novice readers are not recommended to read "Introduction to Algorithms" and "Data Mining: Concepts and Technologies". These two books are thick and heavy. Although the content is also good, you will not know the year of the monkey when you finish reading them. What does a novice need? It's getting started! Secondly, have you really finished reading Python Core Programming? This book is not for Python newcomers. It is very thick and difficult. It is very unfriendly to newcomers. And if you just want to be AI, then many parts of this book don't need to be used. Is web development and Django framework really necessary for our AI engineers? No. Xiao Bai has no distinction between key and non-key points in a book. He spent a lot of time learning unnecessary knowledge, which really does more harm than good. Giving guiding and targeted recommendations is responsible recommendation.The parameter of the function cannot have a property with the same name, otherwise an error is reported.督察尚垶原是警队明日之星，在一次行动中为救战友，不幸被匪徒一枪穿脑，经过抢救后奇迹生还，并且查案比以前更努力拼搏，赢得“铁探”的美誉。但尚垶饱受那次枪击的后遗症折磨，枪伤阴影、暴躁、甚至失禁。而总警司万晞华和Bingo之间神秘的关系，也让那次枪击的真相扑朔迷离。在警队的大升迁年，尚垶被迫卷入了警界高层权力相争的漩涡中。As a result, divorce naturally became our choice, for the sake of independence, but also stop loss.电视动画《中之人基因组【直播中】》改编自おそら著作的同名漫画，描述的是擅长不同类型游戏的玩家们，主角之一入出晓，擅长逃脱类与 RPG 游戏，某天他通关了网上的一款免费手游《中之人基因组》，第二天醒来发现自己居然身处《中之人基因组》这款游戏当中，同样还有七位游戏玩家进入到这个游戏世界，在八位玩家面前出现的神秘人物“驼”，要求他们进行数个赌上自己生死存亡的现实游戏，让游戏的直播播放量达到一亿，而这款《中之人基因组》游戏也似乎与连续的少年少女失踪案件有关。Modify the default policy (default action) of the specified chain of the specified table instead of modifying the rules, you can use the following command.