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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).The lack of money by the poor seems to be due to insufficient resources. In fact, the most deadly thing is the mentality of the poor. In other words, the poorer you are, the more you care about money, the more you care about money, the more you affect your vision and pattern. Without understanding this, many things and plans are out of the question.这是一部网络古装轻喜剧，讲述的是七剑宗庄主孙景麒、与不空、九号、西门、飞花等众人意外卷入一场武林纷争，随即开启的一场哭笑不得的江湖之旅。红椒山芋香荽异口同声地喊道：肯定能熬过去。虽然不舍，心中却并不太伤感。　　志田未来表示：“我从没有接触过有钱人家庭和这Track and field is the oldest sport in sports.