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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).Business Innovation Design (STEP 4): To make up for the opportunity gap, business design innovation is required, including developing new products, implementing new business models, adopting new competitive strategies, etc. Business design can help us to design a business model that can seize market opportunities to achieve strategic objectives and the product mix strategy that should be adopted.The powerful learning methods discovered so far,Programming Class:If you need to go to more than two scenic spots in one day, you strongly recommend a one-day bus ticket, which can be purchased in the stationmaster's room, the bus, the automatic ticketing machine and other places, which is very convenient.一个小混混在阴差阳错间卷进一桩劫金大案，生死命悬一线，疯狂一触即发。为了八吨神秘黄金，混世小太岁、金镖十三郎、满洲第一影后、代庖神父、富家千金，各类人物粉墨登场；日本侵略军、外国公使、野鸡军团、神秘剧组、黑心包租婆，各方势力虎视眈眈。谁敌谁友？谁明谁暗？谁生谁死？ 在一个重兵把守，炮弹都炸不开的金库里，八吨黄金如何被劫走，成为最大悬念。7台kem&now新剧《男子汉之心》6月25日首播，周一周二档，该剧讲述了千金和四个保镖的故事。