You’ve run up against the first thing that seems to really confuse people when they begin learning about networking.
What you thought of as a LAN is a LAN. A VLAN is a Virtual LAN. It’s the same concept but virtualized, allowing more than one LAN on hardware that is just physically a single LAN.
When most people are talking about setting up VLANs they are usually describing the creation of a separate layer 3 subnet and the creation of a VLAN ID that gets tagged to all packets that get sent on that separate subnet. This allows for both layer 2 and 3 separation of the virtual lans on a single physical network.
Conceptually it’s very similar to VM’s running on a single server.
You’ve run up against the first thing that seems to really confuse people when they begin learning about networking.
What you thought of as a LAN is a LAN. A VLAN is a Virtual LAN. It’s the same concept but virtualized, allowing more than one LAN on hardware that is just physically a single LAN.
When most people are talking about setting up VLANs they are usually describing the creation of a separate layer 3 subnet and the creation of a VLAN ID that gets tagged to all packets that get sent on that separate subnet. This allows for both layer 2 and 3 separation of the virtual lans on a single physical network.
Conceptually it’s very similar to VM’s running on a single server.