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A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.令狐冲，你快走。十名地球囚犯被流放在充满危险的星球XT-59，为了生存他们需要踏过大片沼泽地到达幸福岛，这个星球唯一的安全区，恶劣的天气和来自地下的恐怖生物是威胁他们生命阻止他们前进的最大障碍。1. The role of the Sentinel process:香荽无辜地眨眨眼睛：她不是该陪着菡姐姐么？白果更是天真地傻乐，觉得王爷和未来王妃好般配呢，比戏里面演的才子佳人还要才子佳人，因此美滋滋地听两人说话。1. Points for the competition are obtained from advanced competitions. Those with registration fees greater than or equal to 1,000 gold coins will receive points for the competition. There will also be points for the competition for large-scale competitions and in-kind awards. In short, the more you take part in the competition, the more points you score.I follow the execution process of this small program: first, take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to the result, and print it out. It just verified our initial thinking.