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| Section | Objectives |
|---|---|
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Physical environment assessment and constraints - Coverage and capacity planning |
| Wireless Security Design | - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration |
| 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 |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design |
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NEW QUESTION # 24
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
Answer: A
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non-Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions. Wireless intrusion prevention (Option B) detects rogue APs and 802.11 attacks but not Layer 1 RF noise. Wireshark (Option C) is a packet capture tool for Layer 2-7 analysis and cannot detect non-Wi-Fi RF energy. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Post- Deployment Survey, Non-Wi-Fi Interference Identification.
NEW QUESTION # 25
An engineer must assess an existing company WLAN to determine the possibility for future IEEE
802.11ac Wave 2 wireless deployment. All access switches are Fast Ethernet-capable only, and the wired infrastructure between existing APs and access switches is based on the CAT 6A standard. Which two actions provide maximum support of Cisco 3800 Series access points?
(Choose two.)
Answer: B,D
Explanation:
Cisco 3800 Series APs support IEEE 802.11ac Wave 2, which can deliver throughput exceeding
1 Gbps. Fast Ethernet switches are limited to 100 Mbps per port, creating a severe bottleneck.
The two actions that provide maximum support are replacing with mGig switches (Option A) and replacing with gigabit switches with 10G uplinks (Option B). mGig (Multi-Gigabit Ethernet) switches support 2.5G and 5G speeds over existing CAT 6A cabling, allowing the full throughput of 802.11ac Wave 2 APs to be utilized without replacing the existing cable plant. Gigabit switches with 10G uplinks ensure that the access layer can support 1 Gbps per AP port while providing sufficient uplink capacity.
NEW QUESTION # 26
A customer has two Cisco 5520 WLCs that manage all APs throughout the network. The WLCs are in different locations to provide geographical redundancy. A mobility group has been configured on both WLCs and has an UP status on both controllers. The APs in location A are statically configured to use controller A as the primary and controller B as the secondary. If the WLC in location A goes offline, the APs successfully join the WLC in location B, but they do not fail over to their primary configured controller when it recovers.
Which configuration task fixes the issue?
Answer: A
Explanation:
Enabling AP fallback globally on the WLC allows access points to reconnect to their primary controller after they have connected to a secondary controller due to the primary being offline. This is the exact behavior described in the scenario - APs successfully fail over to the secondary WLC but do not return to the primary WLC when it recovers. AP Fallback is a WLC-level setting that monitors the availability of each AP ' s configured primary controller and initiates a reconnection when the primary becomes reachable again.
Without AP Fallback enabled, APs remain on whatever controller they most recently joined - in this case, the secondary - even after the primary recovers. The CAPWAP AP Controller IP Address command (Option A) permanently changes the primary controller configuration on the AP, which is not the intended solution - the AP already has the correct primary configured. DHCP Option 43 (Option B) is used for initial AP discovery, not fallback. AP Failover Priority (Option D) controls which APs are processed first during a failover event, not whether APs return to their primary controller. Reference: WLSD Study Guide - AP Fallback Configuration, N+1 Redundancy Recovery, Controller Primary/Secondary Hierarchy.
NEW QUESTION # 27
An engineer is designing the access layer to support Cisco Catalyst 9130 APs with both radios operating at full capability. Which power design must be specified for the switch ports?
Answer: B
Explanation:
Modern Wi-Fi 6 access points with multiple spatial streams, dual radios, and additional onboard functions such as BLE and integrated sensors draw more power than legacy 802.3af can supply.
When only 15.4 W is available, the AP boots in a reduced-functionality mode - typically disabling a radio, reducing spatial streams, shutting down auxiliary Ethernet ports, or lowering transmit power - which silently undermines the coverage and capacity model the survey was based on.
Specifying 802.3at (PoE+) at up to 30 W per port ensures the AP operates with all radios and features enabled as designed. The design must also confirm the switch's total power budget supports the aggregate draw of every connected AP simultaneously, not merely the per-port rating, and that redundant power supplies are sized accordingly. Cisco Inline Power predates
802.3af and is far below the requirement, and specifying power injectors everywhere adds cost, failure points, and cabling complexity that a properly sized PoE+ switch avoids.
NEW QUESTION # 28
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
Answer: B
Explanation:
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users ?1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput -- this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is therefore: total required throughput divided by throughput per channel = 100 Mbps ?20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the 5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco's high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population.
NEW QUESTION # 29
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