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AOP is Aspect Oriented ProgramIn 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 premise of "being cautious about the end" is to correctly recognize that the loved one is about to or is heading for the end of life.红椒和香荽一愣，大笑道：那满大街卖烤山芋的都是我弟弟了？两个老人则一会去看看板栗，一会又跟小葱说几句，见大家都不慌张，也不好意思淌眼抹泪，便打起精神教导红椒他们，要是遇见别人欺负咋办。倘或跟马三错过了呢，不是更耽误事？田遥觉得她说得有理，不禁急红了眼，一时进退两难，竟不知如何是好了。虽说张家从不曾亏待她们母女，但庶出就是庶出。产科医生王甫芬（张家辉 饰）天资聪慧，但又傲慢自负，对于女友死在他怀中，而自己却束手无策他始终心存愧疚。八年前，他与心内科医生齐百恒（林峯 饰）一块远赴非洲执行援外仼务，亲眼目睹了人类在大自然中生存的韧性，援外的八年中，他的人生观发生了巨大改变。回港后，他不再为名利所累，一切以病人为中心，在慈善家的资助下，开设了龙城医疗中心，专心致志为病人服务。百恒初入龙城，他十分惊诧甫芬的工作作风，甫芬为病人治疗不惧踏医学雷区，不按常理出牌，但往往效果出人意料的好，久而久之，近朱者赤，百恒被其人道主义精神所感染，更被甫芬“即医病又医心” 的品德所感动......