A Virtual Local Area Network (VLAN) is a logical segmentation of network devices that allows systems to appear as though they are on the same local network, regardless of their physical location. VLANs operate at the Data Link layer (Layer 2) and use tagging (such as IEEE 802.1Q) to separate broadcast domains logically.
VLANs improve security, performance, and manageability by isolating traffic between different groups of systems. Devices in the same VLAN can communicate as if they were on the same LAN, even if they are physically distributed across different switches or buildings.
LAN refers to a physical local network, VPN provides encrypted tunnels across networks, and WLAN refers to wireless LANs. Only VLANs provide logical grouping independent of geography.
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