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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).This was a super big case in those days, and the entire Guangdong public security department was mobilized. At this time, they also received an important clue: some Shanwei people who contracted anti-smuggling ships, posing as border guards and customs soldiers, robbed a cargo ship.Specify the types of objects to be created with prototype instances, and create new objects by copying these prototypes. That is, implement the Cloneable interface and override the clone () method.This summer vacation, I took part in the "Social Practice Activities for College Students to Go to the Countryside in Summer" organized by the School of Urban Management of Hunan City University. In order to let students better master professional knowledge, Carry forward patriotic enthusiasm, serve the society and the people attentively, let students have all-round contact, understand the situation of poor areas in society and personality, and through investigation, find out the actual problems existing in the area, analyze and make solutions, and experience and comprehend from them to enhance the sense of mission of college students. In order to cultivate good social adaptation potential and strive to train oneself to become a contemporary college student who is beneficial to the society and the people, Secretary Liu Hui, Secretary of the General Party Branch of the Institute of Urban Management, was arranged to be our leading teacher. Under the form of building a new socialist countryside in the whole country, the theme of our activity is "serving the new countryside and building a new home."廊下又挂了各色灯笼，内置长条木椅、木几和一些小凳子，雅致又不失喜庆。上世纪80年代末，肖然、刘元、陈启明三位大学同学毕业后先后来到改革开放前沿深圳创业。出身农村的肖然和刘元共同喜欢上女同学韩灵。刘元发现了肖然跟韩灵的恋爱关系后狠狠地奚落了肖然，二人产生矛盾。肖然发誓要让韩灵过上富足的生活，他在商场上几经沉浮，终于站住了脚，最后发展成拥有两家上市公司的企业老板。可当他事业走上巅峰的时候，情感却走向了困境。刘元一开始处处与肖然为敌，可他最后发现这并不能让自己快乐起来，于是决定重新规划自己的人生，学会了珍惜和善待身边的每一个人。陈启明因不堪忍受生活的重压“嫁给”了蓝园村村长的女儿，可这段没有爱情的婚姻并没有使他得到幸福。儿子的失而复得、妻子的善良大度让他看到了人性的真善美，最终回归家庭。