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| Section | Objectives |
|---|---|
| Topic 1: RF Fundamentals and Design Principles | - RF behavior and propagation - Antenna types and placement strategies - Channel planning and interference mitigation |
| Topic 2: Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design - Controller-based architecture (WLC) |
| Topic 3: Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| Topic 4: Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Topic 5: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 6: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
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NEW QUESTION # 63
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
Answer: A
Explanation:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick- walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP's signal but cannot hear each other -- making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment.
NEW QUESTION # 64
A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the VoWLAN SSID?
Answer: C
Explanation:
IEEE 802.11v BSS Transition Management is the standard that enables the network (via the AP) to actively provide roaming recommendations and suggestions to associated clients. When enabled on a SSID, the AP can send BSS Transition Management Request frames to clients, informing them of preferred target APs ranked by signal quality, load, and channel conditions. Critically, BSS Transition Management is a voluntary mechanism - clients that support 802.11v can act on the AP ' s recommendation, while clients that do not support 802.11v simply ignore the BSS Transition Request frames and continue operating normally. This selective applicability directly satisfies the requirement that non-VoWLAN clients must not be impacted.
802.11k (Option A) enables clients to build neighbor lists through measurement reports - this is a client- initiated process, not an AP-to-client recommendation. CCKM (Option B) is a Cisco proprietary fast roaming mechanism for legacy clients, unrelated to roaming guidance. 802.11r (Option D) accelerates the re- association handshake during roaming but does not provide proactive roaming recommendations. Reference:
WLSD Study Guide - VoWLAN Design, 802.11v BSS Transition Management, Roaming Optimization Protocols.
NEW QUESTION # 65
A network engineer is preparing a predictive site survey for a new three-story office building before construction is complete. Which two inputs are required to produce an accurate predictive model? (Choose two.)
Answer: C,D
Explanation:
A predictive survey builds an RF model mathematically rather than measuring live signal, so the accuracy of the output depends entirely on the accuracy of the model inputs. Scaled floor plans (Option B) are mandatory - the planning tool must know the true physical dimensions of the space to calculate free-space path loss and AP spacing. If the drawing scale is wrong, every calculated coverage cell is wrong. Wall and building material attenuation values (Option C) are the second required input, because RF propagation indoors is dominated by obstruction loss rather than free- space loss. Drywall, glass, concrete, brick, elevator shafts, and metal racking each attenuate differently, and these values must be applied to the walls drawn on the plan. Spectrum captures and association counts are impossible to collect in a building that has not been built, and AP serial numbers have no bearing on RF modeling.
NEW QUESTION # 66
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: A
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 # 67
A customer has a centralized wireless deployment with N+1 high availability and few open authentication SSIDs configured. After failover, all APs are broadcasting all SSIDs, but the clients are assigned IP addresses from a different subnet. The WLANs on both WLCs are configured with the same dynamic interfaces. Which feature must be incorporated in the wireless design of the second controller?
Answer: B
Explanation:
VLAN Select is a feature that allows for the dynamic assignment of clients to different VLANs from a pool based on various criteria, such as load balancing or location. In a centralized wireless deployment with N+1 high availability, if clients are receiving IP addresses from a different subnet after failover despite the WLANs being configured with the same dynamic interfaces, the issue is that the second controller ' s WLAN interface mapping resolves to a different VLAN or DHCP scope. VLAN Select ensures that client VLAN assignment is consistent regardless of which controller the client connects to, preventing the subnet change behavior observed during failover. Without VLAN Select, even identically named dynamic interfaces on two WLCs may map to different VLANs if the underlying switch configuration differs. RF Protocol (Option A) controls radio parameters. AP Groups (Option B) control SSID and VLAN assignments per AP cluster. AAA Override (Option D) allows RADIUS servers to assign per-user VLANs, which requires authentication - but these SSIDs use open authentication. Reference: WLSD Study Guide - N+1 High Availability Design, VLAN Select Feature, Consistent Client VLAN Assignment Across Controllers.
NEW QUESTION # 68
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