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| Section | Objectives |
|---|---|
| Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Business and technical requirements gathering - Physical environment assessment and constraints |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design - Controller-based architecture (WLC) |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Wireless Security Design | - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies |
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62. Frage
An engineer is estimating the loss between two floors of an office building. Using Ekahau, they have measured -45 dBm at the ground level of the floor with the access point and -50 dBm at the ceiling level of the floor below it. Which value is the loss of the floor?
Antwort: D
Begründung:
Floor loss calculation is a fundamental skill in multi-floor wireless site survey methodology. The floor attenuation value represents the signal power reduction caused by penetrating through a single floor structure including the floor decking, subfloor, ceiling material, plenum space, and any structural elements. In this measurement scenario, the engineer has two data points: -45 dBm measured at the ground level of the floor containing the access point (the signal level just below the AP's floor) and - 50 dBm measured at the ceiling level of the floor below (the signal level just after passing through the floor structure). The floor loss is simply the difference between these two measurements: (-45 dBm) - (-50 dBm) = -45 + 50 = 5 dB. The result is expressed as a positive value (5 dB) representing attenuation -- signal power decreases by 5 dB when passing through the floor.
63. Frage
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
Antwort: B
Begründung:
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.
64. Frage
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?
Antwort: C
Begründung:
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.
65. Frage
A wireless consultant must design a Cisco WLAN. The consultant recommends a solution that requires 12 Cisco 9100 Series APs connected to a Cisco 3800 Series PoE+ switch. Each AP requires PoE+ for full functionality. What is the total PoE requirement in watts?
Antwort: D
Begründung:
This question requires a straightforward PoE power budget calculation. The IEEE 802.3at standard (PoE+) delivers a maximum of 30W at the Power Sourcing Equipment (PSE/switch port). Cisco 9100 Series access points such as the C9120, C9130, and C9136 are designed to operate with full functionality using PoE+ at 30W per AP. The total PoE power requirement for 12 APs is calculated as:
12 APs ?30W per AP = 360W. This figure represents the total power draw that the Cisco 3800 Series PoE+ switch must be capable of supplying across the connected AP ports simultaneously.
The Cisco Catalyst 3800 Series switches offer a total PoE power budget that must be validated against this 360W requirement during the design phase.
Note that some Cisco 9100 APs support higher power modes through IEEE 802.3bt (PoE++), which can provide up to 90W -- but the question specifies PoE+ (802.3at) for the switch infrastructure, making 30W ?12 = 360W the correct answer. Option D (720W) would correspond to 24 APs at 30W each.
66. Frage
A wireless engineer is preparing for a meeting with a customer to discuss a new wireless network design. The customer is a company that develops code and occupies a three-story building.
Which two information points does a pre-site survey questionnaire contain? (Choose two.)
Antwort: A,D
Begründung:
A pre-site survey questionnaire is used to gather information before the physical survey begins, helping to define design requirements. The two most important information points it should contain are the access point density required and the applications that will run over the wireless network. Access point density (Option C) must be understood early because it depends on the number and types of users in each area, directly influencing the survey approach and AP placement strategy. Applications (Option E) are critical because they define the QoS requirements -- a company developing code may run video conferencing, large file transfers, and real-time collaboration tools, each with distinct bandwidth and latency requirements that shape the RF design criteria.
67. Frage
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