(Detailed explanation of the large enterprise network configuration course. This document is a series of experimental courses summed up through the Benet 2.0ATEN textbook of Beida Jade Bird. It mainly introduces some configuration schemes for large-scale networks. The current mainstream cisco switching and routing equipment is used in the experiment. Integrity, most of the experiments are verified by real devices. It truly achieves a complete combination of theory and experiment, which is also the feature of this book, especially suitable for friends who only learn theory and do not have a real equipment environment. Due to reasons such as time and experience, there are inevitably inaccuracies in the text. Xiao Nuo earnestly hopes that everyone can give you pertinent opinions. Comments can be sent to dreamfire@live. In addition, these articles are also published in Xiaonuo's Blog: dreamfire.blog.51cto/. If you have any questions in the article, you can leave a message to Xiaonuo, and Xiaonuo will answer them in the shortest possible time.)