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When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.Compared with online institutions, first of all, customers have stronger trust in physical institutions; Secondly, offline organizations have a strong scene, making it relatively easier to manage teachers and supervise students' learning. In addition, the teacher-student interaction and student-student interaction in offline institutions are more direct and social. However, due to its strong regionality, its customers are more direct and accurate.The following demo is what I saw in the book, but it doesn't matter. We just understand the use of the strategy model. We can use the strategy model to calculate the bonus.小说中，十二星相中的蛇食鹿神君押着小鱼儿，走进宝藏密道。Heroic spirit gives gifts to others讲述了一位身价1000亿韩元的老爷爷在所剩时日无多时偶然得知自己还有个子孙之后展开的故事。该剧以价值1000亿韩元遗产去向的基本故事为中心，蕴含了离别和背叛、阴谋与爱情等事情。