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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Wireless Site Survey | 25% | - Layer 1 site survey analysis - Pre-deployment site survey - Collect design requirements and evaluate constraints - Predictive site survey - Material attenuation and its design effects - Planning tools and network metrics evaluation - Post-deployment site survey |
| Mobility | 25% | - Site Tags - Design mobility groups - Validate mobility tunneling - Optimize client roaming |
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design wireless bridging (mesh) - Design for data, voice, video, location - Design radio management - Physical infrastructure requirements - Logical infrastructure requirements |
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NEW QUESTION # 29
A retailer wants to deploy Cisco Spaces for location analytics with 5 to 7 meter accuracy. Which two AP placement design rules must be followed? (Choose two.)
Answer: A,E
Explanation:
Location accuracy depends on trilateration, which requires signal measurements from multiple geometrically diverse points. A client must be detected by at least three APs - preferably four - at a signal level of -75 dBm or better (Option B), because weaker measurements produce unreliable distance estimates and degrade the calculated position. Perimeter and corner AP placement (Option C) is equally important, because APs deployed only in a straight line or clustered in the center of a floor cannot resolve position perpendicular to that line; the trilateration geometry collapses and clients are reported as being pulled toward the center of the AP cluster. Corner APs anchor the coordinate system and bound the location estimate. Placing APs only down the center aisle is the classic mistake this rule exists to prevent, and converting APs to monitor mode would remove client-serving capability without improving trilateration geometry.
NEW QUESTION # 30
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: B
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 # 31
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: 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 # 32
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
Answer: C
Explanation:
In Cisco's AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort -- it should only receive AP associations when all other options are exhausted.
Configuring the service/dev controller as the tertiary controller in the APs' preference configuration ensures exactly this behavior:
APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages.
NEW QUESTION # 33
An engineer configured the optimized client roaming on Cisco WLC with an RSSI threshold of -72 dBm.
Clients report frequent disconnections. What must be configured for the AP to guide the client to a better AP?
Answer: A
Explanation:
The scenario presents a critical distinction in where Cisco WLC features are configured. Optimized roaming on Cisco WLC is a radio-level feature that monitors connected client RSSI and, when a client ' s signal falls below the configured threshold (-72 dBm), triggers a disassociation to force the client to reconnect to a stronger AP. However, without a mechanism to guide the client proactively before reaching the threshold, clients that disassociate simply reconnect to whatever AP their device selects, potentially causing the reported frequent disconnections. BSS Transition Management (802.11v) is configured at the SSID level and provides the complementary mechanism: before the client reaches the RSSI threshold, the AP sends a BSS Transition Management Request pointing the client toward a specific target AP with stronger signal. The correct architecture requires: optimized roaming configured at the radio level (triggering disconnection when RSSI falls too low) combined with BSS transition enabled at the SSID level (guiding the client to a better AP before forced disconnection). Options C and D incorrectly reverse the configuration levels for these features.
Disabling coverage hole detection (Option B) addresses a different problem and would not resolve the disconnection issue. Reference: WLSD Study Guide - Optimized Roaming Configuration, BSS Transition Management (802.11v), Client Roaming Architecture on Cisco WLC.
NEW QUESTION # 34
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