网络主干结构

本章给出了四种主要的网络主干结构：路由器主干，ＦＤＤＩ主干，帧交换主干以及ＡＴＭ主干，对其结构一一作了分析，说明各自的优点和缺点。

This paper proposes four major network backbone architectures:Router collapsed backbone,FDDI backbone,Frame switched backbone and ATM backbone.It analyses the backbone architecture one by one and respectively presents both their advantages and disadvantages.It gives a more suitable backbone architecture for nowaday's development.