What is Virtual LAN VLAN?

Understanding Virtual LAN VLAN

A logical local area network that extends beyond a single traditional LAN to a group of LAN segments given specific configuration. VLANs are logical network segments that allow network administrators to partition a physical network into isolated broadcast domains. They provide logical separation between different network functions departments or security zones without requiring separate physical infrastructure. VLANs enhance both network performance and security through traffic segregation. VLAN specifications are defined in IEEE 802.1Q and referenced in network security frameworks. Organizations implement VLANs through managed switches network design access control lists inter-VLAN routing and proper security boundaries. For example a university might implement VLANs to segregate network traffic placing administrative systems student networks research networks IoT devices and building management systems on separate VLANs with specific access controls between them ensuring that security compromises in one segment cannot easily spread to other segments despite sharing the same physical infrastructure. Related terms Network segmentation Broadcast domain Layer 2 separation VLAN tagging 802.1Q Trunk port Access port Switch Network isolation Network security.