(The good information is full of comprehensive topology, the variety of equipment is also very complete, and the configuration is appropriate and specific. The lack is to provide some necessary notes for the rookie, a relatively comprehensive example document, a total of 16 pages, including the topology diagram of the network and various The specific configuration of the device is relatively understandable, such as DDN, isdn, these access network technologies, beginners are advised to learn the basic knowledge first, and then it is easier to understand. It is a good choice for friends who want to learn systematically and improve the overall program ability!)
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