What is the primary reason to build a virtual local area network (VLAN)?

The primary reason to build a virtual local area network (VLAN) is to minimize broadcast traffic. By segmenting a larger network into smaller, distinct VLANs, you can effectively limit the scope of broadcast domains. This means that broadcast traffic generated by one VLAN will not saturate the entire network, as broadcasts are confined to the devices within the same VLAN. This segmentation helps improve overall network performance and reduces unnecessary load on connections, leading to more efficient use of bandwidth.

Moreover, incorporating VLANs allows for more organized and manageable network design; administrators can group devices logically based on function, departmental needs, or other criteria, rather than solely relying on physical location. This logical separation enhances control over traffic management without the complexity of extensive physical re-cabling.

Focusing on the other options, while increasing network distance (A) and simplifying physical cabling (D) can be considerations in network design, they are not the primary motivations for creating VLANs. Enhancing network security (B) is a valid benefit of VLANs, but it is often a secondary advantage that comes from the ability to isolate sensitive devices or applications. Overall, minimizing broadcast traffic stands out as the central reason for VLAN deployment.