1. Easy Administration resulting in reduced administration costs,
2. Increased Security due to broadcast control, if you are using simple hub, you can observe traffic corresponding to any node by simply inserting a Network analyzer.
3. Grouping based on functional requirements irrespective of the physical location of nodes, Simplify moves, adds, changes.
They allow logical grouping of users by function.
They can enhance network security.
They increase the number of broadcast domains while decreasing the size of the broadcast domains.
When using VLAN the number and size of collision domains remain the same -> A is not correct. VLANs allow to group users by function, not by location or geography -> B is correct. VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network -> C is correct. VLAN increases the size of broadcast domains but does not decrease the number of collision domains -> D is not correct. VLANs increase the number of broadcast domains while decreasing the size of the broadcast domains which increase the utilization of the links. It is also a big advantage of VLAN -> E is correct. VLANs are useful but they are more complex and need more administration -> F is not correct.