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

Question

Options

• AThey increase the size of collision domains.
• BThey allow logical grouping of users by function.
• CThey can enhance network security.
• DThey increase the size of broadcast domains while decreasing the number of collision domains.
• EThey increase the number of broadcast domains while decreasing the size of the broadcast domains.
• FThey simplify switch administration.

• A
  8% (2)
• B
  88% (23)
• D
  4% (1)

Explanation

VLANs let you logically group users by function (B) regardless of physical location, which directly increases the number of broadcast domains while shrinking each domain's size (E) - fewer devices per broadcast domain means less broadcast traffic and better performance. This segmentation also enhances security (C) by isolating sensitive groups (e.g., finance) from the rest of the network at Layer 2.

Why the distractors are wrong:

• A is wrong because VLANs have no effect on collision domains - switches already eliminate collisions per-port regardless of VLANs.
• D is wrong on two counts: VLANs decrease broadcast domain size (not increase it), and collision domains are unaffected.
• F is a trap - VLANs actually add administrative complexity (you must manage VLAN assignments, trunk links, and inter-VLAN routing), not simplify it.

Memory tip: Think of VLANs as virtual walls inside a switch - they divide broadcast traffic (more, smaller domains), isolate security zones, and group users logically. If an answer says VLANs "increase" a domain size or touch collision domains, it's wrong.

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