A VLAN is a logical subnetwork created within a physical network, allowing network traffic to be separated and isolated without the need for separate cabling.
A VLAN is a logical subnet created within a physical network, allowing for separate and isolate network traffic without needing separate wiring.
Each VLAN functions as an independent network with its own communication rules, even if multiple VLANs share the same physical equipment (switch).
Example :
In a company, the accounting department and the IT department can be on the same physical switch but on separate VLANs to secure traffic and limit access between services.
To remember:
- Separates a physical network into isolated logical networks.
- Improved security, traffic management and performance.
- Each VLAN has a Unique ID and can be routed via a router or a Layer 3 switch.
- Widely used in business networks to segment users, servers and IoT.