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| Section | Objectives |
|---|---|
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| 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) |
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Physical environment assessment and constraints - Coverage and capacity planning |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Wireless Security Design | - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design |
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NEW QUESTION # 37
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?
Ekahau SNR Heatmap -- Post-Deployment Survey Output
Answer: D
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.
NEW QUESTION # 38
A conference center is designing a Wi-Fi 6 deployment for a room holding 2000 attendees, most of whom will use low-bandwidth applications. Which Wi-Fi 6 capability most directly improves efficiency in this scenario?
Answer: D
Explanation:
The defining problem in a high-density room with many low-bandwidth clients is not raw per-client throughput but the overhead of medium contention - under 802.11ac, each small packet requires a full channel access cycle, so the channel spends most of its airtime on contention and preamble rather than payload. OFDMA divides the channel into resource units so the AP can serve multiple clients within a single transmit opportunity, dramatically reducing per-frame overhead when the traffic mix is many small transmissions. This is precisely the profile of a conference audience running chat, email, and browsing. 1024-QAM raises peak modulation but only benefits clients already at very high signal levels and does nothing for contention. 160 MHz channel bonding is counterproductive in high density because it collapses the number of reusable channels. Target Wake Time improves client battery life by scheduling wake intervals, which is valuable for IoT but does not address the airtime efficiency problem in this design.
NEW QUESTION # 39
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
Answer: C
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non- Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions.
NEW QUESTION # 40
An engineer must design and configure a wireless network for pervasive coverage in an oil terminal, casual web and email traffic, 5 GHz. What is the best design?
Answer: D
Explanation:
An oil terminal presents specific wireless design constraints: the requirement is pervasive coverage (maximum geographic coverage) for low-bandwidth applications (casual web and email). These requirements prioritize coverage reach over throughput optimization. The correct approach is to keep all data rates enabled, including lower rates such as 6, 9, 12, and 18 Mbps - because in an industrial environment with challenging RF propagation paths, reflective surfaces, and potential obstructions, lower data rates extend the functional coverage range of each AP. Web and email traffic does not require high data rates; even 1-6 Mbps is sufficient for these applications. Disabling rates below 54 Mbps (Option A) would dramatically shrink each AP ' s effective coverage area, requiring many more APs for pervasive coverage and failing the primary design objective. Assigning static maximum power without RRM auto-adjustment creates excessive co- channel interference. Disabling rates below 24 Mbps (Option C) still reduces coverage reach unnecessarily.
Disabling 802.11n and 802.11ac MCS rates (Option D) prevents the AP from using high-efficiency modulation for nearby clients without coverage benefit. Auto power assignment combined with all rates enabled provides the optimal balance for pervasive industrial deployment. Reference: WLSD Study Guide - Industrial WLAN Design, Coverage vs. Capacity Trade-offs, Data Rate Configuration for Pervasive Coverage.
NEW QUESTION # 41
A customer has a Cisco wireless network with two Cisco Catalyst 9800 Series WLCs in a high availability cluster, 50 Cisco 2800I APs, and all SSIDs and services are 5 GHz only. A security mandate requires that rogue APs be scanned and identified in 2.4 GHz and 5 GHz bands without impacting existing client connectivity. How must the wireless network be reconfigured to meet the requirement without purchasing additional APs?
Answer: D
Explanation:
The Cisco Aironet 2800 Series APs feature a dual-radio architecture with a dedicated 5 GHz radio (slot 1) and a Flexible Radio Assignment (XOR) radio (slot 0) that can operate in either 2.4 GHz or 5 GHz, or be assigned to monitor mode for scanning functions. Since all existing SSIDs and services are 5 GHz only, the slot 1 (dedicated 5 GHz) radio is responsible for all current client connectivity - it must remain in Client Serving mode to maintain uninterrupted 5 GHz WLAN service. The XOR radio (slot 0), currently either idle or operating as a secondary 5 GHz radio, can be repurposed without impacting client service. Setting the XOR radio to Monitor mode enables it to continuously scan all channels across both the 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. In Monitor mode, the XOR radio operates full-time as a dedicated scanner, providing rogue detection coverage on 2.4 GHz (previously uncovered since all services were 5 GHz) and supplementary scanning on 5 GHz. This eliminates the need for additional dedicated monitor mode APs. Options A, C, and D either place the slot 1 radio in a non-client-serving role (disrupting existing connectivity) or use the inappropriate Sniffer mode instead of Monitor mode for rogue detection. Reference: WLSD Study Guide - Cisco 2800 XOR Radio Architecture, Monitor Mode for Rogue Detection, Flexible Radio Assignment, WIDS Design.
NEW QUESTION # 42
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