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An engineer must identify the network requirements for a company that has a main office and 10 branch offices. The network must be able to support data, voice, video, and location tracking. Which two factors must be considered? (Choose two.)
Answer : B, C
When designing a wireless network to support diverse services --- including data, voice, video, and location tracking --- across a distributed enterprise with a main office and 10 branch locations, the two primary design factors directly shaping the RF and capacity architecture are the number of wireless devices requiring access and the type of site where the survey will be performed. The device count (Option B) drives AP density, channel reuse planning, capacity modeling, and controller licensing requirements. Each service type --- particularly VoWLAN and video --- imposes strict per-client throughput and latency constraints that must be multiplied across the concurrent device population. The type of site (Option C) determines the survey approach, attenuation characteristics, coverage requirements, and antenna selection. A warehouse, hospital, or open-plan office each demands a fundamentally different RF design. Options A and D are organizational considerations, not technical RF design inputs. Option E (power sockets) is an installation logistics concern, not a wireless design factor. Reference: WLSD Study Guide --- Requirements Gathering, Site Survey Planning, Capacity and Coverage Design Methodology.
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
Answer : B
In Cisco's AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort --- it should only receive AP associations when all other options are exhausted. Configuring the service/dev controller as the tertiary controller in the APs' preference configuration ensures exactly this behavior: APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages. Configuring it as primary (Option A) or secondary (Option C) would allow APs to join the service controller before exhausting production options. AP failover priority (Option D) governs which APs are processed during controller recovery, not the controller preference order during join. Reference: WLSD Study Guide --- AP Controller Preference Configuration, Primary/Secondary/Tertiary WLC Assignment, Hospital WLAN High Availability Design.
A retail customer opened two new branch locations, and the main store HQ handles data center operations. Each branch location has three Cisco Catalyst 9130 APs. The data center has a Catalyst 9800 WLC with 18 Catalyst 9130 APs. Growing business and poor WAN uplinks cause impacted branch AP and wireless client connectivity back to HQ, and each branch location is now planned to have its own EWC controller based on C9130 AP to keep traffic local. This new design must accommodate: guests and employees sharing the same WLAN with different VLANs, guest uplink and downlink traffic restricted to 2 Mbps, and each branch acting as secondary or tertiary backup to another branch with the data center WLC always being the primary. Which design approach should the consulting engineer take?
Answer : B
This multi-constraint design scenario requires precise alignment of EWC architecture, N+1 redundancy hierarchy, AAA integration, and WLAN security policies. Option B correctly addresses all requirements. With only three APs per branch and a requirement to keep traffic local, converting a single C9130 to EWC mode is the correct and resource-efficient approach --- converting two APs to EWC (Options A and C) wastes AP capacity in a small three-AP branch. The preferred controller set to the EWC AP ensures local APs join locally. The HQ WLC as primary N+1 backup satisfies the data center WLC always being primary requirement. Other branches' EWC APs configured as secondary and tertiary controllers creates the cross-branch redundancy hierarchy. Since guests and employees share the same SSID but require different VLANs, MAC Authentication Bypass (MAB) with AAA override allows the HQ ISE/AAA server to return VLAN attributes based on device or user identity --- dynamically assigning the correct VLAN at the policy level. The 2 Mbps guest rate limiting is applied through per-client QoS policies on the EWC. Option D's use of local web auth for guests does not enable dynamic VLAN assignment from AAA. Reference: WLSD Study Guide --- EWC Architecture, N+1 Redundancy Hierarchy, AAA Override and Dynamic VLAN Assignment.
An engineer is conducting a Layer 2 site survey. Which type of client must the engineer match to the survey?
Answer : D
When conducting a Layer 2 site survey, it is recommended to match the survey to the worst client available. This ensures that the wireless network is designed to provide adequate coverage and performance even for clients with the poorest RF capabilities, thereby providing a consistent user experience for all devices. The worst client typically has fewer antennas, lower receiver sensitivity, and less sophisticated chipsets. By designing to its limitations, the engineer guarantees that every device in the environment meets the minimum performance threshold. Using the best client (Option A) or an average client (Option C) would result in coverage gaps for less capable devices. A phone client (Option B) may have unique characteristics but is not a universally applicable standard for general survey purposes. Reference: WLSD Study Guide --- Site Survey Methodology, Client Selection for Survey, Layer 2 Pre-Deployment Survey.
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
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.
