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以何为证？如何辨真假？我已制备特殊烟花炮，仅我徽王府可以制作。Editor's Note: This article is transferred from WeChat's public number "KMCenter for Knowledge Management" (KMCenter). The author is Tian Zhigang, a well-known knowledge management expert, who is the author of "Your Knowledge Needs Management". The content of this article is the material of "How to Become an Expert". 36 Krypton is authorize to forward.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.In CommonJS's specification, each JavaScript file is a separate module context, in which the attributes created by default are private. In other words, variables defined in one file (including functions and classes) are private and invisible to other files.啊？什么意思？就是转变文字风格其实并不难。在第四季首播集创造了FX电视台20年来的最高收视后，《美国恐怖故事》获得了第五季续订