Local area network (LAN) is a set of computer group composed of several computers in a certain range. The distance is usually within a few kilometers. The role of LAN has shifted from the initial computer interconnection and file printing applications to cloud computing and big data analysis. Several computers in an office can form a LAN, and hundreds of computers in a computer room can also form a large LAN.<br>About the development of local area network (LAN), people first think of the development of computer technology, because of the development of computer technology, people can feel, but by contrast, the development of LAN technology, from the first generation multiplied by the second generation of hub and switch, bandwidth and layer 3 switching time, and then the development of the third generation of intelligent network era, it seems that ordinary Internet users do not recognize Because the network is the infrastructure of the information age and is carried out behind the scenes, ordinary users don't know much about it. They only feel that the speed of the network can provide more services. In fact, all these are inseparable from the continuous growth of network technology.<br>The development of these network technologies provides a solid foundation for the wide application of the network and provides a driving force for the rapid development of the information age. With the rapid development of new system and new network technology, many enterprises need LAN more and more because they are faster, safer, more intelligent and more convenient. This paper focuses on the construction of enterprise LAN and analysis, to provide appropriate solutions and solutions for small and medium-sized enterprises.<br>
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