CCNA Practice Exam Test Sample – Question 40

Which of the following are benefits of VLANs? (Choose three.)

A. They increase the size of collision domains.
B. They allow logical grouping of users by function.
C. They can enhance network security.
D. They increase the size of broadcast domains while decreasing the number of collision domains.
E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.
F. They simplify switch administration.

Correct Answer: B,C,E
Section: LAN Switching Technologies

Explanation:
When using VLAN the number and size of collision domains remain the same ->.
VLANs allow to group users by function, not by location or geography ->.
VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network ->.
VLAN increases the size of broadcast domains but does not decrease the number of collision domains ->.
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 ->.
VLANs are useful but they are more complex and need more administration ->.