網絡交換機，是一個擴大網絡的器材，能為子網絡中提供更多的連接 端口，以便連接更多的計算機。隨著通信業的發展以及 國民經濟信息化的推進，網絡交換機市場呈穩步上升態勢。它具有性能價格比高、高度靈活、相對簡單、易于實現等特點。所以，以太網技術已成為當今最重要的一種局域網組網技術，網絡交換機也就成為了最普及的交換機。
Network switch is a device to expand the network, which can provide more connection ports for the sub network, so as to connect more computers. With the development of communication industry and the advancement of national economic informatization, the market of network switch is steadily rising. It has the characteristics of high performance price ratio, high flexibility, relatively simple and easy to realize. Therefore, Ethernet technology has become the most important LAN networking technology, and network switch has become the most popular switch.