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郑氏忽见香荽面前的碗里有好几只螃蟹，小手上正抓着一只嚼得欢，忙道：香荽，晌午不是跟你说了么，晚上不要吃螃蟹了。After studying the design pattern during this period of time, I still have a lot of feelings, because when I am writing code now, I often think about whether I can use any design pattern to refactor here. Therefore, after learning the design pattern, I feel that it will slowly affect the way you think about writing code. Here is a summary of the design patterns. First, all the design patterns can be sorted out. Second, an index can be made to help everyone collect.To verify SYN? Cookies, first subtract the acknowledge number in the received ACK message segment by 1 to regenerate the SYN? Cookies. The calculation of these truncated hash bit authentication values is based on the IP address, port number, sequence number minus 1, and the value in the password pool corresponding to the index number in the cookie. If the calculated values are the same as those in the cookie, the TCB initializes and starts establishing the connection. The encoded MSS upper bound is used to set an MSS value that does not exceed a reasonable size of the original value. MSS is usually implemented by 3 bits, which correspond to 8 MSS values calculated by MTU (Maximum Transmission Unit) and Ethernet header of general link.III. Principle and Process of CSRF Attack杨长帆笑道，用兵，讲究兵贵神速，咱们行商，有时候也需一蹴而就，要做这门生意，就尽快做绝。The maintenance and testing institutions of fire-fighting facilities with secondary qualifications can be engaged in the testing, repair and maintenance of fire-fighting facilities for buildings with a single building area of less than 40,000 square meters, factories and warehouses with fire risks of less than Class C. Fire safety assessment institutions with secondary qualifications can engage in fire safety assessment of social units and consulting activities on fire laws and regulations, fire technical standards, rectification of general fire hazards, etc.