广域网的图示 口 switch switch at at site 2 high-speed connections between witches computers connected to nerwork switch switch at site 3 口口口 ●互联的程度的取决于 通信量的估算 可靠性需求 8 2021/2/18 2021/2/1 广域网的图示 ⚫ 互联的程度的取决于 – 通信量的估算 – 可靠性需求