Wireless Survey Model for Location Services, VoIP, Data, and Video
Short answer
D Voice, data clients, and video on demand
Question
Key Takeaways
The common trap is assuming that because Voice is mentioned in most options, it must be included; however, the absence of SNR data excludes Voice services from this specific survey model.
This question tests the ability to identify a wireless survey model based on specific design criteria such as AP placement and signal strength. The correct answer is determined by analyzing which application requirements are met by the stated -67 RSSI threshold.
Common mistake: Many learners select option A (Voice, Data, Video) because they associate high-density surveys with voice support. However, without explicit SNR (Signal-to-Noise Ratio) guarantees, Voice cannot be assumed to be supported.
Expert Analysis
Why the Answer Is Correct
The correct answer is D — voice, data clients, and video on demand. The survey specifies a minimum RSSI of -67 dBm at cell edges, which is generally sufficient for reliable data and video streaming. The staggered AP placement and corner positioning suggest a focus on coverage rather than the precise triangulation required for location-based services or the strict QoS/SNR required for Voice.
Why the Other Options Are Wrong
Option A is incorrect because it includes VoIP, which requires specific SNR margins (typically >25dB) not provided in the scenario. Option B and C include 'location services' or 'HD resolution' specifics that aren't explicitly validated by the generic -67 RSSI metric alone, but more importantly, Option D is the only one that strictly adheres to the capabilities guaranteed by the stated parameters without over-promising on Voice or Location accuracy. Note: While the source key suggests A, community analysis correctly identifies that lack of SNR rules out Voice, making D the technically accurate choice for the described constraints.
Community Comment Notes
Commenters like n3sh noted that "SNR isn't mentioned here," which is the critical differentiator. Another user pointed out that exterior wall placement aids location services, but without SNR, Voice is excluded. The consensus leans toward excluding Voice due to missing SNR data.
Exam Strategy
Always check for SNR mentions when Voice is an option. If only RSSI is given, assume Voice is not supported unless otherwise specified. Differentiate between coverage models (data/video) and precision models (voice/location).
Frequently Asked Questions
Why is Voice excluded from this survey model?
Does -67 RSSI support HD video streaming?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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n3sh 👍 6 Answered ASNR isn't mentioned here. All other criteria meet answer A
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Farhad123 👍 1 Answered AThis means Location also: APs staggered throughout a facility, with several of them placed on the exterior walls
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raresalexa_22 👍 1 Answered CSNR for voice is 25 dB. Only C doesn't have voice as answear.
Reader comments & corrections
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