Which role of VLANs is incorrectly stated?

The role of VLANs is fundamentally about logical segmentation of networks rather than physically increasing bandwidth on switch interfaces. VLANs allow groups of devices to communicate as if they are on the same physical network, regardless of their actual physical location. By doing this, they can enhance security by isolating sensitive data traffic within specific VLANs and allowing only authorized users to access those networks.

While VLANs can help manage network traffic and reduce broadcast traffic by creating isolated broadcast domains, this does not translate to an increase in the physical switch interface bandwidth. The physical limitations of the switch ports remain unchanged, so creating VLANs does not enhance or increase the capacity of those interfaces.

Other benefits of VLANs include improving network robustness by enabling better traffic management and organization of devices, as well as providing flexibility in managing network resources. This organizational capability allows for easier administration of segmented network traffic and strengthens overall network reliability and security.