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Don't rely solely on internal defense mechanismsIn 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).　　当选后的杨桂花工作开展的并不顺利，村里的男人们都不服气，而女人们则有的妒嫉杨桂花，这样刚上任的杨桂花面临窘境。第一个阻碍就来自于自己的丈夫孙有为，面对他的不支持，杨桂花屡次解释不成，俩人的关系剑拔弩张。幸好王红粉和李亚米等好姐妹全力支持杨桂花的工作，这让杨桂花感到稍许欣慰。该剧共10集，是纪录片风格，时间设定在第一部电影推出后15年(类似真实生活时间)，讲述东高一群学生设计排演音乐剧《歌舞青春》，发现戏外的抓马跟剧中一样多。每集会有一首新歌，加上一首来自原电影的曲目。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.-towing light, 3 nautical miles;　　柯诺克曾是一名骗徒，改邪归正成了医生，搬到阿尔卑斯山旁的富有山庄，接手退休医师的诊所，他下定决心在这裡赚大钱，不料当地居民个个身强体壮，一点赚头都没有，他只好用诚恳笑容和三寸不烂之舌，强力渲染各种疾病无所不在，没病没痛的村民都被柯诺克诊断出大病大症，还被再三嘱咐要定期回诊，很快地诊所挤满了各式症状的病患，不论病情是真是假。