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| Section | Objectives |
|---|---|
| Topic 1: Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| Topic 2: Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Business and technical requirements gathering - Coverage and capacity planning |
| Topic 3: Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design - Controller-based architecture (WLC) |
| Topic 4: High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Topic 5: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 6: RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
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質問 # 124
Users who leave the office with a wireless headset must be able to hand oft the voice call with minimal disruption. The engineer drafted four possible Door plans for AP placement:
- red dots and arrows represent the direction of travel
- blue dots represent the AP placements
Which floor plan provides the requested functionality?
正解：B
解説：
VoWLAN handoff quality is fundamentally determined by the AP placement strategy relative to the direction of user movement. When a user is in motion carrying an active voice call, the roaming event must occur before signal quality degrades below the minimum acceptable VoWLAN threshold (typically -67 dBm for voice, with a minimum SNR of 25 dB). This requires the user to encounter increasing signal strength from a neighboring AP before the current AP's signal drops below the threshold. The optimal AP placement follows the principle of overlapping coverage along the predicted path of travel -- APs must be positioned so that as a user moves, they progressively enter the coverage zone of the next AP while still within adequate range of the current one. Floor plan B represents the correct design where APs are positioned along the travel path with sufficient cell overlap (typically 15-20%) to ensure seamless 802.11r fast BSS transitions. Incorrect floor plans place APs perpendicular to travel direction, at path endpoints only, or with insufficient overlap zones -- all of which create roaming dead zones where the handoff occurs too late, causing voice call disruption.
質問 # 125
An engineer is upgrading the legacy APs to 802.11ac Wave 2 capable APs. The existing gigabit uplinked switches provide 802.3at. Which switch limitation is a concern?
正解：D
解説：
The primary concern when upgrading to 802.11ac Wave 2 capable APs with existing switches that only provide IEEE 802.3at (PoE+, 30W maximum) is the output power limitation. 802.11ac Wave 2 APs, particularly Cisco ' s 3800 and 4800 series, can require significantly more power than 30W to operate all radios and capabilities at full capacity. The Wave 2 standard introduced features such as Multi-User MIMO (MU-MIMO), beamforming, and additional spatial streams, all of which increase power consumption. When an AP doesn ' t receive sufficient power, it may reduce transmit power, disable radios, or reduce the number of spatial streams - directly degrading wireless performance. Interface throughput (Option A) may also be a concern with multi-gigabit capable APs, but the question specifically asks about the limitation introduced by
802.3at, which is directly a power delivery constraint. Collision domains (Option C) and high availability (Option B) are unrelated to the PoE standard. Reference: WLSD Study Guide - PoE Upgrade Planning,
802.11ac Wave 2 Infrastructure Requirements, Switch Power Budget Considerations.
質問 # 126
An engineer is performing capacity planning for an open-plan office with 900 concurrent devices, each requiring 2 Mbps of application throughput. Assuming approximately 120 Mbps of usable aggregate throughput per 5 GHz radio, how should the AP count be determined?
正解：B
解説：
Capacity-driven design starts with aggregate demand rather than area. Here 900 devices at 2 Mbps each represent 1800 Mbps of required throughput; dividing by roughly 120 Mbps of usable per-radio throughput yields a minimum of about 15 client-serving radios, before applying any headroom for growth or peak concurrency. That number is then cross-checked against the coverage model, because the resulting AP density must still deliver the required RSSI and SNR everywhere without creating excessive co-channel interference - if capacity demands more APs than coverage requires, transmit power and channel width are reduced to keep the cells small enough to coexist. Designing purely from coverage radius (Option A) is the classic failure mode in dense environments, producing enough signal but nowhere near enough airtime. Fixed device- per-AP ratios ignore the actual application profile, and available switch ports are a constraint to satisfy, not a method for sizing the RF design.
質問 # 127
An engineer is implementing a wireless design for a manufacturing company with a Catalyst
9800, a stack of two Catalyst 9300-48HX switches, and 9166 APs. Each AP must be named using the Zone-053424189-01X string where X is the area number. The engineer needs to connect the APs to the switch stack using PoE. How many APs must the engineer connect to the stack so that they run with full functionality?
正解：C
解説：
The Cisco Catalyst 9300-48HX is a high-density PoE switch specifically designed for Cisco Catalyst 9100 Series AP deployments. The 48HX variant features 48 Multi-Gigabit PoE ports with IEEE 802.3bt (PoE++) support, providing up to 90W per port. The Cisco 9166 Access Point is a Wi-Fi 6E AP that requires IEEE 802.3bt (PoE++) power to achieve full radio functionality -- enabling all three radios including the 6 GHz radio. In a two-switch stack of 48HX units, the total PoE budget is designed and rated to support full-port utilization with Cisco 9100 series APs simultaneously. The design intent is to connect APs to all ports on all switches -- maximizing the deployment density and ensuring every AP runs with full functionality. Connecting to only half the ports on one switch (Option B), half of each switch (Option C), or all ports on only one switch (Option D) would underutilize the infrastructure and fail to achieve the full deployment density that the switch stack was architected to deliver. The AP naming scheme requiring sequential area numbering requires all APs to be connected and fully operational across the entire stack.
質問 # 128
An engineer is deploying new APs to serve IEEE 802.11g through 802.11ac clients and wants to use the Ekahau Site Survey tool to verify RF coverage. Management wants the engineer to verify and create coverage maps as quickly as possible. Which configuration accomplishes the goal?
正解：A
解説：
In Ekahau Site Survey, passive mode involves listening to beacon frames and probe responses from deployed APs without the survey laptop actively associating to any SSID. This is significantly faster than active mode because no association, DHCP, or throughput test overhead is introduced - the surveyor simply walks the floor while Ekahau passively captures signal strength data from all visible APs simultaneously. Using two wireless adapters in passive mode provides a critical speed advantage: one adapter scans 2.4 GHz channels while the second adapter simultaneously scans 5 GHz channels. Without dual adapters, a single adapter must time-multiplex between bands, reducing the sample rate per band and either slowing the survey walk or producing sparser data. Active mode (Options B and C) is used when throughput measurements are required for specific application validation such as voice or video, but it is inherently slower due to association overhead and sequential testing. The combination of passive scanning and dual adapter configuration delivers the highest possible data collection rate per unit of walk time. Reference: WLSD Study Guide - Ekahau Site Survey Modes, Passive vs. Active Survey Methodology, Multi-Adapter Survey Configuration.
質問 # 129
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