Switches create separate collision domains, but a single broadcastdomain.
交换机分割冲突域，但只有一个广播域。
2
E. Bridges define broadcastdomain while switches define collision domains.
桥定义广播域而交换机定义冲突域。
3
To further aid in scalable management, each SU has its own broadcastdomain (SU-to-SU and SU-to-World communications are routed -- check for bottlenecks).
为了进一步帮助可伸缩管理，每个 SU 有自己的广播域（路由 SU-to-SU 和 SU-to-World 通信 —— 检查瓶颈）。