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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).总结道：仗诸位将士用命，我大靖方才稳若磐石，将窃国之贼擒拿。It was listed as an Olympic event in 1908 and cancelled in 1920. It was not resumed until 1972.但是——他猛然提高声音——咱们何不把这当作一个机会：经过这样的苦练。Proxy objects can be instantiated instead of ontologies and can be accessed remotely.Why is it so important to simply divide three categories?