Network topology diagram refers to the network structure diagram composed of network node equipment and communication medium. The topology diagram shows the network configuration and connection of network server and workstation. Its structure mainly includes star structure, ring structure, bus structure, distributed structure, tree structure, mesh structure, honeycomb structure, etc. Cellular topology is commonly used in WLAN. It is characterized by point-to-point and multi-point transmission of wireless transmission media (microwave, satellite, infrared, etc.), which is a kind of wireless network, suitable for urban network, campus network and enterprise network.