(How to set up a small and medium-sized network, how to choose materials, tools, and how to wire, set parameters and so on. . . . How many computers does a network have to be considered a small network? There are no clear rules. People generally regard a network of less than 100 computers as a small local area network. Small office networks are mainly used for file transfer and shared access to the Internet. When selecting equipment for a small office network, in addition to meeting the daily use of the office network, the stability and security of the network must be considered first, and then the network speed. Only when these two points are met can the reliable delivery of office documents be guaranteed. The topology of a small office network is similar to a dormitory network built with switches and routers, and is estimated based on the equipment required for an office network with 42 information points. . . . . . . . .)