What is the main advantage of using a VLAN in a network?

The main advantage of using a VLAN (Virtual Local Area Network) in a network is the reduction in broadcast traffic. VLANs segment a larger network into smaller, isolated subnets, which means that broadcast packets are confined within each VLAN. This isolation prevents broadcast traffic from affecting devices in other VLANs, leading to reduced congestion on the network and improved overall performance. By limiting the scope of broadcasts, VLANs enhance bandwidth efficiency and responsiveness, particularly in larger networks where broadcast traffic can become overwhelming.

In contrast, while improved physical security can be a benefit of VLANs through better segmentation, it is not the primary advantage. Increased data transfer rates are not inherently linked to the introduction of VLANs since they do not influence the speed of individual data transfers. Simplified network management can occur through VLANs due to better organization and control, but again, this is a secondary benefit compared to the significant impact on broadcast traffic reduction.