Collision Domains, Broadcast Domains, and VLANs
When creating any Ethernet LAN today, you use LAN switches and routers. You also have to think about older legacy devices like hubs and bridges, just in case some still exist. The different parts of an Ethernet LAN can behave differently, in terms of function and performance, depending on which types of devices are used. These differences then affect a network engineer’s decision when choosing how to design a LAN.
The terms collision domain and broadcast domain define two important effects of the process of segmenting LANs using various devices. This section defines these terms to explain how hubs, switches, and routers impact collision domains and broadcast domains.