Understanding VLANs: Virtual Local Area Networks

What is a VLAN?

A Virtual Local Area Network (VLAN) is a method of network segmentation that creates isolated logical networks within a physical switch. Unlike traditional LANs, which rely on physical topology to group devices together, VLANs provide virtualized segmentation, allowing network administrators to define communication boundaries without being restricted by physical connections.

Each VLAN functions as an independent network, meaning devices within the same VLAN can communicate directly, while communication between different VLANs requires a Layer 3 device (router or Layer 3 switch). This logical separation improves security, performance, and network management.