The basics of VLANs

To understand the future, we first need to understand the past. Before switches, we had hubs where we would plug in all our devices; I am talking about a star topology using twisted-pair cabling.

The problem with using hubs is that they created one collision domain and one broadcast domain, there was no way of making it better, unless you physically segmented each network, which is insane.

Let's look at a star topology using hubs, so we can understand this concept better:

The star topology you see is using hubs. Every time someone transmits data, everyone is privileged to hear that noise on the network. This is considered ...

Get CCNA Routing and Switching 200-125 Certification Guide now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.