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| Section | Objectives |
|---|---|
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Cisco Wireless Architecture | - Mobility groups and roaming design - Controller-based architecture (WLC) - Lightweight Access Point (LAP) deployment models |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - RF behavior and propagation - Channel planning and interference mitigation |
| High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Wireless Security Design | - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
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NEW QUESTION # 41
A consulting engineer is preparing to survey a brownfield deployment for a 6000-sqft building with four floors that have APs. The entire building is being remodeled and the furniture, office walls, and decoration are being updated. The engineer must perform a survey analysis on the potential RF impact of newer furniture materials. How must the survey be conducted?
Answer: D
Explanation:
A brownfield deployment scenario involves an existing operational wireless network where a physical remodel will change the RF environment. The engineer ' s task is to assess the impact of new furniture and wall materials on the existing AP placement - a scenario requiring a predictive re-analysis of how changed materials will alter propagation from the existing AP locations. Using a survey tool such as Ekahau with the known AP positions superimposed on updated floor plans, the engineer can reconfigure material attenuation properties to reflect new construction materials and re-run the predictive propagation model. This produces a before/after comparison identifying coverage gaps or interference hotspots introduced by the remodel without requiring physical downtime or temporary infrastructure changes. Option A (sweep analysis) measures existing signal strength but does not model future material changes. Option B (neighbor AP statistics) evaluates the current RF environment using WLC data, not future conditions. Option C (throughput measurements) tests current performance, not future RF impact. Reference: WLSD Study Guide - Brownfield Survey Methodology, Material Attenuation Modeling, Post-Remodel RF Impact Analysis.
NEW QUESTION # 42
A network engineer must design a new Cisco wireless solution that contains three Cisco 9800-40 WLCs.
WLC1 and WLC2 will be combined into one logical unit with SSO and a backup WLC named WLC3 will be joined by using a mobility tunnel. Link redundancy between the WLCs and the switches is required. Which WLCs must the design provide connectivity to the network equipment for LAG to be effective in an SSO failover scenario?
Answer: A
Explanation:
In a Cisco Catalyst 9800 SSO deployment using Link Aggregation Group (LAG) for network interface redundancy, the SSO pair - WLC1 (active) and WLC2 (standby) - must both have their physical interfaces connected to the network infrastructure as part of the LAG bundle. LAG on the 9800 in an SSO configuration is implemented as a multi-chassis LAG across both the active and standby controllers. This means both WLC1 and WLC2 contribute physical member links to the port channel, and the connected switches must have LACP or PAgP bundle members from both controllers in the same port channel group. When an SSO failover occurs - WLC1 fails and WLC2 takes over as active - the LAG remains operational because WLC2 ' s physical links are already established members of the bundle and continue forwarding traffic without any link renegotiation. If only WLC1 had LAG connectivity and WLC2 had independent links, an SSO failover would cause a LAG topology change requiring re-convergence, introducing downtime. WLC3 is a separate N+1 backup controller joined via a mobility tunnel - not part of the SSO pair and its LAG configuration is independent. Reference: WLSD Study Guide - Catalyst 9800 SSO with LAG, Multi-Chassis Link Aggregation, High Availability Network Redundancy Design.
NEW QUESTION # 43
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. Changing the color scheme (Option A) only modifies the visual representation without filtering data. The RSSI calibration tool (Option B) adjusts how the tool perceives signal levels, not the display filter. Filtering by AP (Option D) would remove APs from the view, potentially hiding coverage gaps. Reference: WLSD Study Guide - Post-Deployment Survey, Ekahau Heat Map Tools, RSSI Coverage Filtering.
NEW QUESTION # 44
An engineer is finalizing the design for a WLAN dedicated to wireless VoIP handsets. Which setting should be applied to this WLAN, and why?
Answer: D
Explanation:
Band Select works by suppressing 2.4 GHz probe responses to dual-band capable clients, deliberately withholding replies so the client is nudged toward discovering the 5 GHz radio instead. That suppression introduces delay into the probe and discovery process, which is harmless for a laptop associating once at the start of the day but damaging for a handset attempting to find a roam target while a call is in progress. Cisco's guidance is therefore to disable Band Select on voice WLANs and instead steer handsets to 5 GHz through client configuration or by not enabling the SSID on 2.4 GHz at all. Client Load Balancing should also be disabled on voice WLANs for the same class of reason - it rejects association attempts to encourage the client toward a different AP, which can block a roaming handset from joining the AP it actually needs. Passive Client mode addresses devices that do not send traffic until polled, such as certain industrial controllers, and is unrelated to handset roaming.
NEW QUESTION # 45
A wireless engineer must design a WLAN for a university that requires outdoor Wi-Fi access.
Which obstruction has the greatest effect on wireless signal propagation?
Answer: D
Explanation:
In outdoor wireless deployments, foliage -- particularly dense trees -- represents the most significant and variable RF obstruction that engineers must account for during site survey and design. Trees are problematic for multiple compounding reasons: the high water content of living tissue causes signal absorption consistent with the principle that water is an effective absorber of
2.4 GHz and 5 GHz RF energy; the irregular branching structure causes multi-path scattering; and foliage density changes seasonally, meaning signal propagation characteristics measured during winter may differ substantially from summer readings when leaves are fully developed. A fully leafed deciduous tree can attenuate a 5 GHz signal by 6?5 dB depending on density and depth.
NEW QUESTION # 46
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