What is the main function of VLANs in VMware networking?

VLANs, or Virtual Local Area Networks, play a crucial role in VMware networking primarily by segmenting network traffic. This segmentation enhances both performance and security within a virtualized environment. By isolating different types of traffic into separate VLANs, administrators can effectively manage bandwidth usage, reduce congestion, and implement security protocols more easily.

For instance, traffic for different departments can be segregated, ensuring that sensitive data from finance isn't exposed to users in marketing. This not only mitigates security risks but also optimizes the performance of network resources by limiting broadcast traffic and reducing the chances of network collisions.

Additionally, VLANs allow for a more flexible network design, making it easier to scale and adapt the network structure without the need for extensive physical reconfiguration. This modularity is particularly beneficial in dynamic virtualization environments where workloads may frequently change.

In summary, the primary function of VLANs is to segment network traffic effectively for improved performance and enhanced security, making option B the most accurate answer in this context.