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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).尹旭点点头，转而对吴芮说道：秦国覆亡是迟早的事，吴先生不为番邑的将来打算吗？吴芮叹了口气，说道：打算？打算什么？如何打算？尹旭沉声道：吴先生素来心怀大志，这番邑在您治理下，一片祥和。该剧讲述了“七七事变”后，毕业于日本陆军士官学校的前清贝勒瑞年回国后成为八路军高级指挥员，投身于抗日战争中的故事。一旁，曹氏见张杨望着他们兄妹出神，微微诧异，低声道：老爷可是为南瓜下场担忧？张杨摇头，对她笑道：没有。8. If the screen remains black, congratulations, it's done! Your iPhone7Plus has entered DFU mode.《中国医生》是国内首部以医护群体为主角的大型医疗纪录片。纪录片将镜头对准全国各地六家大型三甲医院，选取最具代表性的科室及医护人员，聚焦普通人与医院最常发生交集的场景，通过跟踪拍摄一个个有温情、有责任、有矛盾、也有希望的医患故事，多视角呈现了医生这一职业的不同面向，解读医疗系统在国民生命进程中扮演的重要角色，真实地展示中国医生们救死扶伤道路上的悲欢离合。"Sensitivity is also called ISO, which is simply how much light a mobile phone feels when shooting. According to your on-site light, if the on-site light is sufficient, of course, it can be low. If the light is insufficient, it is natural to use high sensitivity. After the high sensitivity comes out, the noise of the photo will be greater. The so-called noise is the kind of noise that you see with a lot of graininess. "