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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).01　少年の国Serbia: 450,000　　这里面有传奇的生涯，有令人眼花缭乱的商战，有浓烈奇特的真情。更有一个不断追求奋斗的高贵灵魂。Focus, feedback and fix it. All learning methods cannot be separated from "3F".故事发生在电影《美国队长》之后，1946年战争结束了，和平的到来反而使她被社会排挤。随后她加入了霍华德·史塔克的机构SSR (Strategic Scientific Reserve)，做一些行政和秘密任务。即使失去了史蒂夫·罗杰斯，她依然要面对人生。“特工卡特”首次现身银幕是在2011年的电影《美国队长》（Captain America: The First Avenger）中，当时由海莉·阿特维尔（Hayley Atwell）饰演这个角色，作为“美国队长”的恋人，卡特在前者撞机之后成立了“神盾局”保卫国家安全。2013年漫威曾制作《特工卡特》的电影短片，故事内容是关于美国历史上最令人震惊的十二宫连环案，而在《美国队长2：冬日战士》（Captain America: The Winter Soldier）中，卡特也曾短暂现身，不过此时的她已经是耄耋老人命不久矣。