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张大栓和郑长河听见马蹄响，刘黑皮又大喊：来了。但战争，终究会留下痕迹。When asked what he expected from the thinking ability course, one of the parents' answers was very universal: "The main purpose of offering the thinking ability course to the child is to give the child some inspiration in thinking mode, and to let the child form a good thinking and learning habit. After entering primary school in the later period, he can quickly adapt to learning without falling behind."一个人的言行举止，是跟信心有关的。哈哈哈——正在办公室中密切关注的吕文心发出哈哈大笑。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).张无忌就该是这样。