CWDP-305 Sample Questions & Answers
Channel planning, coverage analysis and the underlying RF design make up nearly half the weighting, alongside validating and optimizing the finished network, gathering customer requirements and WLAN specs, and installing or configuring infrastructure.
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- Question 1Advanced
Design the WLAN · 6 GHz Planning (Wi-Fi 6E/7)
A multinational corporation is deploying a Wi-Fi 6E network across its new campus in a country where the 6 GHz band requires the use of an Automated Frequency Coordination (AFC) system for standard power APs. The design includes both indoor standard power APs and outdoor APs. How does the AFC requirement impact the design and operation of the network?
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Correct answer: C
This correctly describes the function of AFC. Standard power APs (both indoor and outdoor) must have a way to determine their geographic location (e.g., GPS) and send this to the AFC service. The AFC checks a database of incumbent 6 GHz users (like fixed microwave links) and provides the AP with a set of channels and maximum power levels it can use at that specific location without causing interference.
- Question 2Intermediate
Design the WLAN · Predictive Modeling
A warehouse design includes numerous aisles of tall, metallic shelving. A predictive survey model for this environment shows significant RF reflection and multipath issues, leading to unstable connectivity for barcode scanners. Which design modification would be most effective at mitigating these specific issues?
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Correct answer: C
This is the industry best practice for warehouse aisles. Using directional antennas confines the RF signal primarily within the aisle, minimizing reflections off adjacent shelving and creating a clean, strong signal path for devices operating within that aisle. This directly mitigates the multipath problem.
- Question 3Advanced
Design the WLAN · Architecture Selection
Case Study: Global Logistics Firm WLAN Architecture
A global logistics company, 'ShipFast', is redesigning the WLAN for its 150 distribution centers worldwide. Each site has a mix of corporate office space and large warehouse areas. The company's IT team is small and centrally located. They have outlined several key requirements for the new design.
Business Requirements: The primary goal is to improve operational efficiency by providing reliable connectivity for inventory scanners, autonomous forklifts, and employee tablets. The solution must provide centralized visibility and control over all 150 sites from a single interface. A key financial constraint is to minimize the need for skilled IT staff at each remote site.
Technical Requirements: The network must support distinct security policies for corporate users, warehouse devices (using MPSK), and a guest network. The warehouse network requires seamless roaming with low latency to support the autonomous forklifts. The solution must be highly available, ensuring that a WAN outage at a remote site does not disrupt local warehouse operations. The company also wants to leverage network analytics to track device location and traffic patterns.
Given these requirements, which WLAN architecture provides the best fit for ShipFast?
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Correct answer: D
This architecture is the ideal fit. It provides a single pane of glass for centralized management and analytics, meeting the central IT team's needs. It requires zero on-site controller hardware, minimizing remote site complexity. By forwarding data locally (a distributed data plane), it ensures that a WAN outage does not affect local operations and provides the low latency needed for the forklifts. This model perfectly balances central control with local survivability.
- Question 4Intermediate
Design the WLAN · Performance Optimization
True or False: In a high-density Wi-Fi 6 (802.11ax) deployment, BSS Coloring is primarily designed to increase the maximum throughput for a single client.
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Correct answer: B
False. BSS Coloring is a spatial reuse technique. Its primary purpose is to improve overall network efficiency and capacity in dense environments by allowing APs to differentiate between transmissions from their own Basic Service Set (BSS) and an overlapping BSS on the same channel. This reduces unnecessary deference to transmissions from other networks, allowing more devices to transmit concurrently. It improves system-level performance, not necessarily the peak throughput of a single client.
- Question 5Beginner
Deploy the WLAN · Physical Installation
During the physical installation of APs in a newly constructed hospital wing, the technician discovers that the installed Ethernet cabling is Cat5e. The design specifies Wi-Fi 6 APs (802.11ax) that require 802.3at (PoE+) power. What is the most likely issue this scenario will cause?
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Correct answer: B
The primary concern is not the data-carrying capacity of Cat5e, but its ability to support higher PoE standards. While Cat5e can technically carry 802.3at power, the issue is often with the power sourcing equipment (the switch). If the switch only supports older 802.3af (PoE) standards, it will not provide enough wattage for a PoE+ AP. This will cause the AP to either not power on or operate in a degraded mode (e.g., with radios disabled or at lower power).
- Question 6Intermediate
Deploy the WLAN · Supporting Services
You are configuring a new WLAN controller for a corporate environment. The security policy requires that wireless users are placed into different VLANs based on their departmental affiliation, which is stored as an attribute in Active Directory. Which set of services must be configured to achieve this dynamic VLAN assignment?
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Correct answer: B
This is the correct solution. The client (supplicant) authenticates via 802.1X to the RADIUS server. The RADIUS server (integrated with Active Directory) checks the user's group membership. Based on configured policies, the RADIUS server sends back an Access-Accept message containing specific attributes (like Tunnel-Private-Group-ID) that instruct the controller to place the user into the appropriate VLAN.
- Question 7Intermediate
Validate and Optimize the WLAN · Post-Deployment Survey
After deploying a new WLAN, a validation survey is performed. The designer compares the predictive survey results from the planning phase with the actual post-deployment survey results. The actual coverage shows significant deviations from the predictive model in several key areas. What is the most common reason for such a discrepancy?
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Correct answer: B
This is the most frequent cause of significant differences between predictive models and reality. The accuracy of a predictive design is entirely dependent on the quality of the input data. If the floor plans were outdated, or if a wall specified as drywall was actually concrete block, the real-world attenuation will be vastly different from the model, leading to major coverage deviations.
- Question 8Intermediate
Validate and Optimize the WLAN · Roaming Validation
A university is experiencing issues with VoWiFi calls dropping as users walk between two academic buildings connected by an outdoor courtyard. A post-deployment survey confirms adequate signal strength (-65 dBm or better) from both buildings' APs throughout the courtyard. Analysis of client roaming behavior shows that devices are remaining associated with the AP in the first building until the signal drops to -80 dBm before roaming to the much stronger AP in the second building. This phenomenon is known as:
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Correct answer: C
This scenario perfectly describes the sticky client problem. The client device's roaming algorithm is not aggressive enough, causing it to 'stick' to its currently associated AP far longer than it should, even when a much better roaming candidate is available. This results in poor performance and dropped connections as the client moves away from its original AP.
- Question 9Advanced
Validate and Optimize the WLAN · Troubleshooting and Remediation
Case Study: Manufacturing Plant Optimization
A large manufacturing plant recently deployed a new Wi-Fi 6 network. Post-deployment validation testing reveals several critical issues. The plant floor is a challenging RF environment with metal machinery, moving gantries, and high levels of 2.4 GHz interference from industrial equipment.
Validation Findings: An active validation survey was performed. In the parts assembly area, throughput tests consistently fail to exceed 50 Mbps, despite excellent signal strength (-55 dBm). Spectrum analysis in this area shows a high noise floor at -70 dBm in the 2.4 GHz band and a clean 5 GHz band. In the packaging area, VoWiFi calls have poor quality with robotic-sounding audio, and roaming tests show devices are slow to handoff between APs. The current design uses omnidirectional APs mounted at 30 feet, with transmit power set to maximum on all APs.
Requirements: The assembly area requires a minimum of 100 Mbps throughput for data-intensive tablets. The packaging area requires MOS scores of 4.0 or higher for VoWiFi calls and seamless roaming for handheld scanners. The plant manager has rejected any solution that involves running new cable drops.
Which combination of remediation actions will most effectively address all the identified issues?
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Correct answer: C
This is the most comprehensive solution. It addresses the assembly area's throughput problem by moving clients away from the noisy 2.4 GHz band to the clean 5 GHz band, resolving the high noise floor issue. For the packaging area, it correctly identifies that high transmit power is creating sticky client problems; lowering power creates smaller, well-defined cells that encourage timely roaming. Enabling 802.11k/r assists this process for capable clients. Finally, implementing QoS (WMM AC_VO) is essential for prioritizing the VoWiFi traffic and achieving high MOS scores.
- Question 10Intermediate
Validate and Optimize the WLAN · Voice and Video Testing
To ensure a new WLAN design for a hospital meets the stringent requirements for Voice over Wi-Fi (VoWiFi), which performance metric is most critical to measure during the application testing phase?
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Correct answer: C
Mean Opinion Score (MOS) is the industry-standard metric for quantifying the perceived quality of real-time voice. It is a composite score from 1 (bad) to 5 (excellent) that is calculated based on latency, jitter, and packet loss. Testing and achieving a target MOS (typically >4.0) is the most direct way to validate that the network can support high-quality VoWiFi.
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