What is a true property of VLANs?

• A. It extends beyond a traditional LAN and groups users based on administratively defined boundaries
• B. It is a wireless LAN
• C. It is a physical LAN that uses fiber
• D. It is a home network

Answer: (A)

VLANs are about logical network segmentation. They let you group users and devices by administrative policy (such as department or function) rather than by where they’re physically located. That means the same VLAN can span multiple switches and even different buildings, effectively extending the network beyond a single LAN. Traffic within one VLAN stays in that VLAN’s broadcast domain, and devices in different VLANs don’t see each other at Layer 2 unless a router or Layer 3 device routes between them. VLANs are implemented with tagging on trunk links (802.1Q) so multiple VLANs can travel over a single physical connection, while access ports attach end devices to a specific VLAN.

The other descriptions don’t capture this core idea: a VLAN isn’t defined by being wireless, nor by the physical medium (like fiber), nor by being a home network.