ACMA WLAN Design 2 — Questions and Answers
Question 1: A hospital needs wireless coverage in areas with thick concrete walls and metal equipment. Which AP placement strategy is most appropriate?
- Place APs only in hallways to maximize coverage
- Use a higher-density AP deployment with lower transmit power (Correct answer)
- Use a single high-power AP per floor to penetrate walls
- Deploy APs exclusively in patient rooms
Correct answer: Use a higher-density AP deployment with lower transmit power
Higher AP density with lower transmit power improves coverage in RF-challenging environments like hospitals by reducing the impact of obstacles.
Question 2: Which antenna type is best suited for providing coverage in a long, narrow hallway?
- Omnidirectional dipole antenna
- Patch antenna
- Yagi directional antenna (Correct answer)
- Sector antenna
Correct answer: Yagi directional antenna
A Yagi directional antenna focuses RF energy in a narrow beam, making it ideal for long hallway deployments.
Question 3: In a multi-floor office building, what is the primary concern when designing WLAN coverage to avoid co-channel interference between floors?
- Using the same channel on every floor
- Selecting non-overlapping channels and controlling vertical signal bleed (Correct answer)
- Increasing transmit power on all APs
- Disabling 5 GHz radios on alternate floors
Correct answer: Selecting non-overlapping channels and controlling vertical signal bleed
Vertical co-channel interference between floors is managed by using non-overlapping channels and adjusting AP power/tilt to limit signal propagation between floors.
Question 4: What is the purpose of a pre-deployment RF site survey?
- To configure AP IP addresses before installation
- To identify existing RF interference, coverage gaps, and optimal AP placement (Correct answer)
- To test the internet bandwidth available at the site
- To count the number of client devices that will connect
Correct answer: To identify existing RF interference, coverage gaps, and optimal AP placement
A pre-deployment site survey identifies interference sources, obstacles, and ideal AP locations before physical installation begins.
Question 5: Which 5 GHz channels in the US are considered UNII-2 and may require DFS?
- Channels 36, 40, 44, 48
- Channels 52–144 (Correct answer)
- Channels 149, 153, 157, 161
- Channels 1, 6, 11
Correct answer: Channels 52–144
UNII-2 and UNII-2e channels (52–144) require Dynamic Frequency Selection (DFS) because they overlap with weather radar frequencies.
Question 6: A retail store wants to track customer movement patterns using WLAN infrastructure. Which Aruba feature supports this use case?
- ARM (Adaptive Radio Management)
- Aruba Meridian location services (Correct answer)
- RAP (Remote Access Point)
- CPPM guest access portal
Correct answer: Aruba Meridian location services
Aruba Meridian provides indoor location services, including customer movement analytics, using the WLAN infrastructure.
Question 7: When deploying APs in an outdoor environment, what is the main RF design consideration compared to indoor deployments?
- Outdoor environments have more multipath reflections
- Free-space path loss is lower outdoors, requiring fewer APs
- Outdoor APs use only 2.4 GHz due to rain attenuation at 5 GHz
- Fresnel zone clearance and longer propagation distances must be considered (Correct answer)
Correct answer: Fresnel zone clearance and longer propagation distances must be considered
Outdoor WLAN design must account for Fresnel zone obstruction and much longer signal propagation distances compared to indoor scenarios.
ACMA WLAN Design 2
A hospital needs wireless coverage in areas with thick concrete walls and metal equipment.
Which AP placement strategy is most appropriate?