Internet 共筆 20171019 #3
Description
E-mail >>>email
強波器(repeater):repeat the signal >(把接收到的訊號放大)> extend the network
//1dB *10 = 2dB (log )10倍數成長
Bridge (橋接器): Connet two compatible networks
ex . 光纖>> 電線
Switch(交換器): 解決人多嘴雜的問題(eg . C3取2 )使通訊量互不影響
router(路由器): an intersection 概念近似於匝道
function>> like a police officer on the crossroads