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| Section | Objectives |
|---|---|
| Wireless Security Design | - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| RF Fundamentals and Design Principles | - Channel planning and interference mitigation - Antenna types and placement strategies - RF behavior and propagation |
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Coverage and capacity planning - Physical environment assessment and constraints |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
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NEW QUESTION # 14
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 # 15
An engineer is designing coverage for a distribution warehouse with 12 m ceilings and metal racking that reaches 10 m. Which antenna design approach should be used?
Answer: B
Explanation:
In a high-bay warehouse, an omnidirectional antenna mounted at the ceiling radiates most of its energy horizontally across the top of the racking, where no clients exist, while the aisles below sit in the antenna's null. Metal racking and dense inventory further block any signal that does propagate downward. High-gain directional antennas - typically patch or narrow-beam downtilt models - concentrate energy into a defined pattern that can be aimed down the aisle or vertically into the picking area, delivering usable signal to scanners and forklift terminals at floor level while limiting spill into adjacent aisles. That containment also improves channel reuse in a space that is otherwise one large open volume. Mounting APs facing upward or at floor level places the antenna where it will be blocked or physically damaged, and low-gain omnidirectional antennas lack the pattern control this environment demands.
NEW QUESTION # 16
An engineer in a branch office that does not have a wired backhaul must ensure that local clients can be switched locally and authenticated centrally. In which mode must the AP be configured?
Answer: B
Explanation:
Flex+Bridge mode is a specialized AP operating mode that combines two distinct Cisco wireless capabilities:
FlexConnect (for local switching of client data traffic and central authentication via the WLC) and Bridge
/Mesh mode (enabling wireless backhaul when no wired Ethernet uplink is available). In a branch environment without wired backhaul, a standard FlexConnect AP (Option D) cannot operate because FlexConnect still requires an Ethernet connection for its control plane. Bridge mode alone provides mesh backhaul but does not support the local switching with central authentication model required here. MAP (Option A) is a Mesh Access Point role for wireless backhaul, and RAP (Option C) is a Root Access Point with a wired connection - neither meets the no-wired-backhaul requirement with local switching.
Flex+Bridge uniquely satisfies both requirements: the Flex component allows locally switched VLANs to be bridged directly to the access layer without traversing the WAN, while the Bridge component enables the AP to use a wireless mesh link for its backhaul uplink. Central authentication is maintained via the CAPWAP control tunnel over the mesh link. Reference: WLSD Study Guide - FlexConnect Design, Mesh Networking, Flex+Bridge Mode Configuration and Use Cases.
NEW QUESTION # 17
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs.
To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
Answer: B
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment).
This tunneling adds encapsulation overhead - CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor. Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping - reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead. Setting matching MTUs (Option A) does not prevent fragmentation if the effective tunnel MTU is lower than the client segment size. Increasing the MTU (Option B) is often constrained by physical infrastructure. Setting the DF bit (Option D) would cause packets to be dropped rather than fragmented.
Reference: WLSD Study Guide - Anchored WLAN Design, CAPWAP Mobility Tunnel MTU, TCP MSS Clamping.
NEW QUESTION # 18
The wireless team must configure a new voice SSID for optimized roaming across multiple WLCs with Cisco 8821 phones. Which two settings accomplish this goal? (Choose two.)
Answer: C,E
Explanation:
For optimized roaming across multiple Wireless LAN Controllers (WLCs) with Cisco 8821 IP phones, two critical settings must be configured. First, configuring mobility groups between WLCs (Option A) allows for seamless inter-controller roaming by establishing mobility tunnels between controllers, enabling them to share client security context, preventing re-authentication when a phone roams from an AP on one WLC to an AP on another. Second, using Cisco Centralized Key Management (CCKM) for authentication (Option B) reduces the time required for re- authentication during roaming from a full 802.1X exchange to a single-message re-key process.
CCKM stores the wireless security keys at the WLC level, enabling rapid key re-derivation during roaming without contacting the RADIUS server.
NEW QUESTION # 19
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