In a WLAN network, which of the following descriptions about directional antennas and omnidirectional antennas are correct? (Multiple choice)

Question

Options

• AWhen the coverage distance is long, omnidirectional antennas are preferred
• BDirectional antennas are suitable for coverage areas such as pedestrian streets
• CIn outdoor scenarios, try to use omnidirectional antennas for planning
• DIn outdoor scenarios, omnidirectional antennas are easier to plan than directional antennas.

• A
  7% (2)
• B
  78% (21)
• C
  15% (4)

Explanation

B is correct because directional antennas concentrate RF energy in a narrow beam, making them ideal for long, linear coverage areas like pedestrian streets, corridors, or hallways where you need range along one axis without wasting signal in irrelevant directions. D is correct because omnidirectional antennas radiate in a simple 360° pattern, so their coverage footprint is predictable and easy to model - planning just requires placing circles on a map, requiring less complex site survey work compared to directional antennas whose beam angles and tilt must be carefully aimed.

A is wrong because long-distance coverage calls for directional antennas - concentrating power in one direction extends range, whereas omnidirectional spreads power equally in all directions, reducing effective range. C is wrong because outdoor scenarios often involve longer distances and interference management where directional antennas are actually preferred for their focused gain; the recommendation is to use directional antennas outdoors, not omnidirectional ones.

Memory tip: Split C and D carefully - C claims omni antennas are the recommended outdoor choice (wrong), while D only claims they're easier to plan (correct). "Easy ≠ preferred" is the trap the exam is testing.

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