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| Section | Weight | Objectives |
|---|---|---|
| Wireless Site Survey | 25% | - RF propagation and attenuation analysis - Layer 1 site survey execution and analysis - Pre-deployment survey and validation - Design requirements collection and constraint evaluation
|
| WLAN High Availability and Security Design | 20% | - Management and monitoring design - Security architecture design
|
| Mobility Design | 25% | - Roaming optimization
- Mobility architecture models
|
| Wireless Infrastructure Design | 30% | - Wireless Controller architecture and deployment
|
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NEW QUESTION # 118
An engineer must perform a predictive wireless survey to indicate the number of access points required. The engineer has created a new project and imported the floor plan. Which step must be taken next for accurate AP placement?
Answer: A
Explanation:
After creating a new predictive survey project and importing the floor plan, the next mandatory step is to set the scale of the floor plan. Setting the scale is critical because all subsequent measurements -- AP coverage radius, cell overlap calculations, and distance-based attenuation modeling -- depend on the accuracy of the floor plan's physical dimensions. If the scale is incorrect, the predictive model will place APs at incorrect distances relative to each other and produce inaccurate coverage predictions. The scale is typically set by the engineer clicking on two known points on the floor plan and entering the real-world distance between them, calibrating the software's measurement system.
NEW QUESTION # 119
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
Answer: B
Explanation:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick-walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP ' s signal but cannot hear each other - making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment. Reference:
WLSD Study Guide - RF Design Fundamentals, Hidden Node Problem, Transmit Power and Cell Size Optimization.
NEW QUESTION # 120
An engineer is performing capacity planning for an open-plan office with 900 concurrent devices, each requiring 2 Mbps of application throughput. Assuming approximately 120 Mbps of usable aggregate throughput per 5 GHz radio, how should the AP count be determined?
Answer: C
Explanation:
Capacity-driven design starts with aggregate demand rather than area. Here 900 devices at 2 Mbps each represent 1800 Mbps of required throughput; dividing by roughly 120 Mbps of usable per-radio throughput yields a minimum of about 15 client-serving radios, before applying any headroom for growth or peak concurrency. That number is then cross-checked against the coverage model, because the resulting AP density must still deliver the required RSSI and SNR everywhere without creating excessive co-channel interference - if capacity demands more APs than coverage requires, transmit power and channel width are reduced to keep the cells small enough to coexist. Designing purely from coverage radius (Option A) is the classic failure mode in dense environments, producing enough signal but nowhere near enough airtime. Fixed device- per-AP ratios ignore the actual application profile, and available switch ports are a constraint to satisfy, not a method for sizing the RF design.
NEW QUESTION # 121
An engineer is performing a passive survey report. The coverage heat map shows the entire site with all signal levels. To see only the desired coverage, which action must the engineer take?
Answer: C
Explanation:
To focus the coverage heat map on the desired coverage threshold, the engineer should use the RSSI slider to set the heat map to the desired cutoff filter. This action adjusts the display to show only the signal levels that meet or exceed the specified RSSI value, effectively filtering out weaker signals and highlighting areas with sufficient coverage. In Ekahau and similar survey tools, the RSSI slider provides a dynamic way to set minimum signal thresholds, allowing the engineer to quickly validate whether coverage meets design targets such as -67 dBm for voice or -70 dBm for data.
NEW QUESTION # 122
Refer to the exhibit. A wireless engineer is using the Ekahau Site Survey tool to conduct a post-deployment survey. The engineer analyzes the pictured output to determine if SNR meets the voice requirements. How is the voice support based on the output?
Exhibit - Q15: Ekahau SNR Heatmap - Post-Deployment Survey Output
Answer: A
Explanation:
Voice over WLAN (VoWLAN) deployments require a minimum SNR threshold to maintain acceptable Mean Opinion Score (MOS) values for call quality. Cisco ' s 300-110 WLSD curriculum specifies that VoWLAN requires a minimum SNR of 25 dB throughout the coverage area. In an Ekahau post-deployment survey SNR heatmap, when the heatmap displays a consistent color indicating SNR at or above this threshold across the entire surveyed area - including all rooms, corridors, and common areas such as the lobby - the conclusion is that voice service is supported in all locations. The color coding in Ekahau ' s SNR heatmap uses green tones to indicate adequate SNR (typically #25 dB) and shifts toward yellow and red for degraded conditions.
When the exhibit heatmap shows uniform adequate coverage across all surveyed areas without yellow or red zones, it confirms the SNR requirement for VoWLAN is universally met. Options A, B, and C suggest partial or no coverage, which would be indicated by mixed or poor SNR values - conditions not present in this scenario. The post-deployment survey with Ekahau is the validation step confirming that the predictive design was accurately realized in the physical environment. Reference: WLSD Study Guide - VoWLAN Design Requirements, SNR Thresholds, Post-Deployment Survey Validation with Ekahau.
NEW QUESTION # 123
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