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| Section | Objectives |
|---|---|
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
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NEW QUESTION # 115
An engineer is estimating the loss between two floors of an office building. Using Ekahau, they have measured -45 dBm at the ground level of the floor with the access point and -50 dBm at the ceiling level of the floor below it. Which value is the loss of the floor?
Answer: B
Explanation:
Floor loss calculation is a fundamental skill in multi-floor wireless site survey methodology. The floor attenuation value represents the signal power reduction caused by penetrating through a single floor structure including the floor decking, subfloor, ceiling material, plenum space, and any structural elements. In this measurement scenario, the engineer has two data points: -45 dBm measured at the ground level of the floor containing the access point (the signal level just below the AP ' s floor) and -50 dBm measured at the ceiling level of the floor below (the signal level just after passing through the floor structure). The floor loss is simply the difference between these two measurements: (-45 dBm) - (-50 dBm) = -45 + 50 = 5 dB. The result is expressed as a positive value (5 dB) representing attenuation - signal power decreases by 5 dB when passing through the floor. Expressing it as -5 dB (Option B) would incorrectly imply a signal gain. The 95 dB values (Options A and D) result from incorrectly adding rather than subtracting the dBm values - a common error when working with negative dBm figures. This floor attenuation value (5 dB) would then be entered into Ekahau ' s floor material properties to improve predictive model accuracy. Reference: WLSD Study Guide - Multi-Floor Signal Propagation, Floor Attenuation Factor (FAF), Ekahau Floor Loss Measurement Methodology.
NEW QUESTION # 116
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: C
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 # 117
A network engineer is designing a new wireless network for a campus. The network must include optimized performance, avoid interference, availability in high-density areas, and roaming. Which two approaches must be taken? (Choose two.)
Answer: A,C
Explanation:
The design requirements - optimized performance, interference avoidance, high-density support, and roaming capability - collectively point to a dual-band strategy using narrow channel widths. For 5 GHz operation (Option A), 20 MHz channels are the correct choice for high-density and campus-scale deployments. The 5 GHz band has a significantly greater number of non-overlapping channels compared to
2.4 GHz (up to 24 non-overlapping 20 MHz channels in UNII-1, UNII-2, and UNII-3), enabling a robust channel reuse plan with minimal co-channel interference. Wider 5 GHz channels (Options C and E - 80 MHz and 40 MHz) would consume multiple channel blocks, dramatically reducing the number of available non-overlapping channels and increasing co-channel interference in dense deployments. For 2.4 GHz operation (Option B), 20 MHz channels are mandatory - there are only three non-overlapping 20 MHz channels (1, 6, 11) in the 2.4 GHz band. Using 40 MHz channels in 2.4 GHz (Option D) eliminates all non- overlapping channel separation, causing massive co-channel interference and is universally contraindicated in enterprise designs. Reference: WLSD Study Guide - Channel Planning, High-Density Design, Frequency Band Selection.
NEW QUESTION # 118
A wireless engineer must design a backhaul link. The engineer has a mesh access point that has a wired connection back to the infrastructure. What must be changed in the AP role before a change is made in the AP mode?
Answer: C
Explanation:
In Cisco mesh networking architecture, access points are classified into two primary roles: Root Access Points (RAP) and Mesh Access Points (MAP). A RAP is an access point that maintains a wired Ethernet backhaul connection back to the network infrastructure, while a MAP operates wirelessly, relying on mesh backlinks to upstream RAPs. When an engineer needs to change an AP mode - such as switching to bridge mode to extend the mesh - the AP role must first be defined correctly. The AP must be designated as a RAP before any mode-level configuration changes are applied. This sequencing is critical because the AP role defines the fundamental backhaul path; changing the mode without first establishing the role results in misconfiguration and potential connectivity loss. The RAP communicates directly with the wired infrastructure via its Ethernet port, making it the gateway for all downstream MAPs in the mesh topology. Options A (monitor), C (bridge), and D (local) refer to AP modes, not roles, and cannot be configured until the role is properly defined.
Reference: WLSD Study Guide - Mesh Networking Fundamentals, Outdoor Wireless Design, AP Role and Mode Configuration.
NEW QUESTION # 119
A network design supports data and voice in 2.4 GHz and 5.0 GHz. The design must support asset tracking without affecting the existing design. Which action must be taken?
Answer: B
Explanation:
Cisco ' s WLAN location and asset tracking architecture (based on Cisco Spaces or legacy Cisco MSE/CMX) relies on the ability to receive and measure the RF signal from tagged assets at multiple APs simultaneously.
For accurate location determination using triangulation or trilateration algorithms, a minimum of three APs must receive the tag ' s signal with sufficient RSSI. Monitor mode APs are dedicated to passive RF listening
- they do not transmit client-serving SSIDs and focus their full radio attention on scanning all channels for signal measurement. Placing monitor mode APs specifically on the perimeter of an asset tracking area provides the spatial diversity and boundary detection capability needed to accurately triangulate assets throughout the interior, without requiring any modifications to the existing data/voice serving APs. Adding monitor mode APs at the perimeter as an overlay ensures the existing 2.4 GHz and 5 GHz voice/data design is entirely undisturbed. Adding local mode APs (Option B) would serve clients and compete for channel capacity. Grouping APs closer (Option C) reduces capacity and increases co-channel interference. Increasing transmit power (Option D) worsens hidden node conditions without improving location accuracy. Reference:
WLSD Study Guide - Cisco Location Services, Monitor Mode APs, Asset Tracking and WLAN Overlay Design.
NEW QUESTION # 120
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