黄色完整版

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).那如何七战七捷？我们小队出兵设诱埋伏，等他们前来，外面的狼兵伺机包抄，我军摆阵先射箭，再操铳，且战且退诱敌深入，狼兵至左右伺机冲击，周总督率兵断后路。Unfortunately, there is not only one kind of electric light in this world. Many hotels have another kind of electric lamp, which has only one switch, but its performance is: the first time it is pressed to turn on the weak light, the second time it is pressed to turn on the strong light, and the third time it is turned off. Now the above code must be modified to complete the manufacture of this new type of electric lamp:令寻寻在这段情感中成长与蜕变，找回真实的自我......成厉也最终克服幽闭恐惧症，事业上收获成功。当他们回忆起初时的一切，原来，早在那时，便已注定是你······A5.1. 3.1 Hearing function test: whisper test.