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VLANs function at the data link layer of the OSI model. They operate by tagging network frames with a unique VLAN identifier as they traverse switches and routers. This tagging ensures that data frames are correctly routed to their respective VLANs, maintaining the segregation between different segments of the network.
To configure VLANs, the process typically involves assigning specific ports on a switch to VLANs based on predetermined rules. For instance, at home, your guest Wi-Fi might be set to operate on its VLAN, keeping visitors' devices isolated from your personal devices.
Different Types of VLANs
There are several types of VLANs, each serving different networking needs: