Describe what a VLAN is and one benefit of using VLANs in an enterprise network.

Describe what a VLAN is and one benefit of using VLANs in an enterprise network.

• A. A VLAN is a firewall device that segments networks.
• B. A VLAN is a virtual local area network that segments networks at Layer 2; benefit: reduces broadcast domains and improves security and traffic management.
• C. VLANs operate only in wireless networks.
• D. VLANs replace routers.

Answer: (B)

A VLAN is a virtual local area network that creates logical segmentation within a switch-based network, operating at Layer 2. Devices in the same VLAN share a broadcast domain, while devices in different VLANs are isolated from each other unless routed. VLANs use tagging (such as 802.1Q) on trunk links to carry multiple VLANs over the same physical connection, allowing centralized management while keeping traffic separated. One major benefit is reducing broadcast domains, which limits unnecessary broadcast traffic to the intended group and improves network performance. This separation also enhances security by isolating groups of devices, so policies can be applied to each VLAN without affecting others; inter-VLAN communication is controlled and typically requires routing, enabling centralized security controls.

A VLAN is a virtual local area network that creates logical segmentation within a switch-based network, operating at Layer 2. Devices in the same VLAN share a broadcast domain, while devices in different VLANs are isolated from each other unless routed. VLANs use tagging (such as 802.1Q) on trunk links to carry multiple VLANs over the same physical connection, allowing centralized management while keeping traffic separated.

One major benefit is reducing broadcast domains, which limits unnecessary broadcast traffic to the intended group and improves network performance. This separation also enhances security by isolating groups of devices, so policies can be applied to each VLAN without affecting others; inter-VLAN communication is controlled and typically requires routing, enabling centralized security controls.