Master Your Network Interview

Answer (Study & Explanation):

A VLAN (Virtual Local Area Network) is a logical segmentation of a Layer 2 network that allows devices to be grouped into separate broadcast domains, independent of their physical location. VLANs operate by tagging Ethernet frames using the IEEE 802.1Q standard, enabling multiple logical networks to coexist on the same physical infrastructure.

Enterprises prefer VLANs because they significantly reduce broadcast traffic, improve network performance, and enhance security by isolating sensitive systems such as finance, HR, or production servers. Instead of deploying separate switches and cabling for each department, VLANs allow efficient utilization of hardware while maintaining strict logical separation. This design also simplifies scalability, as new departments or services can be introduced through configuration changes rather than physical rewiring.