(This is my graduation design thesis. This paper integrates network engineering planning and design, equipment selection, VLAN division, subnet division, IP distribution, transmission and cabling, network management and other technologies. The purpose of this topic is to build an extensible network that can realize high-speed Internet access and is safe enough to meet the application of various services such as e-mail sending and receiving, file transmission, multimedia teaching, etc., so as to meet the various needs of modern teaching.)