Which statement best describes a VLAN according to the material?

• A. A VLAN is a wireless standard
• B. A VLAN is a routing protocol
• C. A VLAN is a physical separation by cabling
• D. A VLAN is a logical subgroup within a LAN created via software.

Answer: (D)

A VLAN is a logical subgroup within a LAN created via software, which lets you segment the network into separate broadcast domains without changing physical cabling. By configuring switches with VLAN IDs and assigning ports to specific VLANs, devices in the same VLAN can communicate as if they share the same network, while devices in different VLANs require routing to reach each other. This isn’t a wireless standard or a routing protocol, and it isn’t simply about physical separation of cables—the separation is defined in software, giving flexible, scalable network segmentation.