CWS CWS Site Survey Fundamentals 5 — Questions and Answers
Question 1: Which 802.11 amendment introduced the 6 GHz band (Wi-Fi 6E) and is particularly beneficial for reducing interference in dense survey environments?
- 802.11ac (Wi-Fi 5)
- 802.11ax (Wi-Fi 6/6E) (Correct answer)
- 802.11n (Wi-Fi 4)
- 802.11g
Correct answer: 802.11ax (Wi-Fi 6/6E)
802.11ax (Wi-Fi 6E) extends operation into the 6 GHz band, which is currently free of legacy devices, providing a clean spectrum environment for new deployments.
Question 2: During a site survey, a surveyor walks a data collection path and notices the software shows data points far apart on the floor plan. What is the MOST likely cause?
- The Wi-Fi adapter is transmitting at too high a power level
- The surveyor is walking too fast for the software's data collection interval (Correct answer)
- The AP is broadcasting on multiple SSIDs simultaneously
- The floor plan image resolution is too low
Correct answer: The surveyor is walking too fast for the software's data collection interval
Survey software collects data at set intervals; walking too quickly creates large gaps between data points, leaving areas unmeasured on the heatmap.
Question 3: What is the primary reason a CWS should conduct a post-deployment validation survey after AP installation?
- To bill the client for additional hours of work
- To verify the deployed network meets design specifications and coverage requirements (Correct answer)
- To reprogramme all APs with updated firmware automatically
- To confirm the vendor's warranty registration was completed
Correct answer: To verify the deployed network meets design specifications and coverage requirements
A post-deployment (validation) survey compares actual measured performance against the original design targets, identifying any gaps or underperforming areas.
Question 4: A facility manager wants Wi-Fi coverage only in specific rooms, not in adjacent parking lots. Which AP antenna type BEST achieves this requirement?
- Omnidirectional dipole antenna
- Directional (patch or sector) antenna aimed inward (Correct answer)
- High-gain isotropic antenna mounted outdoors
- Rubber-duck omnidirectional antenna on each AP
Correct answer: Directional (patch or sector) antenna aimed inward
Directional antennas concentrate RF energy in a specific direction, reducing signal leakage to unintended areas like parking lots while improving coverage within target zones.
Question 5: In a CWS site survey, what does 'adjacent channel interference' (ACI) refer to?
- Interference from APs on completely non-overlapping channels
- Interference caused by signals from partially overlapping channels (Correct answer)
- Signal loss due to the physical distance between two APs
- Interference between the wired Ethernet and wireless portions of an AP
Correct answer: Interference caused by signals from partially overlapping channels
ACI occurs when channels partially overlap in frequency (e.g., channels 1 and 3 in 2.4 GHz), causing their signals to bleed into each other and degrade performance.
Question 6: Which of the following BEST describes 'multipath' in RF propagation and its effect on Wi-Fi?
- A routing protocol that sends packets over multiple network paths simultaneously
- RF signals reflecting off surfaces and arriving at the receiver at different times, causing distortion (Correct answer)
- The process of bonding multiple Wi-Fi channels to increase throughput
- Signal loss that only occurs in outdoor point-to-point links
Correct answer: RF signals reflecting off surfaces and arriving at the receiver at different times, causing distortion
Multipath occurs when RF signals reflect off walls, floors, and objects, arriving at slightly different times and potentially causing destructive interference or 'dead spots.'
Question 7: When a site survey report recommends a specific AP mounting height, what is the PRIMARY factor driving that recommendation?
- Regulatory requirements mandate APs must be installed above 8 feet in commercial buildings
- Optimal height balances coverage radius, minimizing interference to adjacent cells while serving client devices at desk level (Correct answer)
- Higher mounting always doubles the coverage area regardless of environment
- AP vendors void warranties if devices are mounted below 10 feet
Correct answer: Optimal height balances coverage radius, minimizing interference to adjacent cells while serving client devices at desk level
Mounting height affects the coverage footprint and the signal angle toward client devices; too high can cause excessive overlap and interference, while too low limits range.
CWS CWS Site Survey Fundamentals 5
Which 802.11 amendment introduced the 6 GHz band (Wi-Fi 6E) and is particularly beneficial for reducing interference in dense survey environments?