IT Explanations

Clear explanations of IT concepts, protocols, architecture and enterprise technologies.

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Infrastructure, cloud and security
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Abstract network visualization showing connected devices and switches with visual separation into different virtual LAN.

What Is a VLAN (Virtual LAN)? Definition, How It Works, and Use Cases

A VLAN (Virtual LAN) is a logical grouping of devices into separate broadcast domains on shared physical switch infrastructure, using IEEE 802.1Q tagging. This explainer covers how VLANs work, access vs trunk ports, inter-VLAN routing, security limits, and how VLANs differ from subnets and VXLAN.

Jul 4, 202619 min readbeginnerEmanuel De Almeida