FLASH教学，包含内容：电路交换，分组交换，路由器工作原理，频分复用，时分复用，统计时分复用，虚拟局域网，中继器，网桥工作原理等。精彩形象，好东西不容错过，快来下载-FLASH teaching, including : circuit-switched, packet-switched, routers principle, frequency division multiplexing, TDM, TDM statistics, virtual LAN repeaters, bridges