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| Section | Weight | Objectives |
|---|---|---|
| Wireless Infrastructure Design | 30% | - Wireless Controller architecture and deployment
|
| WLAN High Availability and Security Design | 20% | - Security architecture design
|
| Mobility Design | 25% | - Guest mobility and BYOD design - Mobility architecture models
|
| Wireless Site Survey | 25% | - Layer 1 site survey execution and analysis - Design requirements collection and constraint evaluation
- RF propagation and attenuation analysis |
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問題 #95
The wireless team must configure a new voice SSID for optimized roaming across multiple WLCs with Cisco 8821 phones. Which two settings accomplish this goal? (Choose two.)
答案:C,E
解題說明:
For optimized roaming across multiple Wireless LAN Controllers (WLCs) with Cisco 8821 IP phones, two critical settings must be configured. First, configuring mobility groups between WLCs (Option A) allows for seamless inter-controller roaming by establishing mobility tunnels between controllers, enabling them to share client security context, preventing re-authentication when a phone roams from an AP on one WLC to an AP on another. Second, using Cisco Centralized Key Management (CCKM) for authentication (Option B) reduces the time required for re- authentication during roaming from a full 802.1X exchange to a single-message re-key process.
CCKM stores the wireless security keys at the WLC level, enabling rapid key re-derivation during roaming without contacting the RADIUS server.
問題 #96
Which profile is included within a site tag when configured in a Cisco 9800 WLC architecture?
答案:A
解題說明:
The Cisco Catalyst 9800 IOS XE WLC uses a tag-based configuration architecture. Three primary tag types are used: site tags, policy tags, and RF tags. The site tag associates an AP with its operational context and contains two specific profile references: the AP join profile (defining AP-level parameters such as NTP, syslog, SSH, LED behavior, and CAPWAP timers) and the flex profile (defining FlexConnect-specific parameters including locally switched VLANs, split tunneling, local authentication settings, and VLAN-ACL mappings). The flex profile within the site tag enables the AP to operate in FlexConnect mode with locally configured switching behavior when WLC connectivity is lost. QoS (Option A) policies are applied at the policy tag level within WLAN policies. NAT (Option B) is not a native profile type in the 9800 tag architecture. VLAN (Option D) configurations are defined within the flex profile or policy profile and are not standalone profile types at the tag level. Understanding the three-tag model is essential for designing and troubleshooting 9800-based deployments. Reference: WLSD Study Guide - Catalyst 9800 Configuration Model, Site Tag Architecture, Flex Profile and AP Join Profile.
問題 #97
Refer to the exhibit. A wireless engineer is using the Ekahau Site Survey tool to conduct a post- deployment survey. The engineer analyzes the pictured output to determine if SNR meets the voice requirements. How is the voice support based on the output?
Ekahau SNR Heatmap -- Post-Deployment Survey Output
答案:C
解題說明:
Voice over WLAN (VoWLAN) deployments require a minimum SNR threshold to maintain acceptable Mean Opinion Score (MOS) values for call quality. Cisco's 300-110 WLSD curriculum specifies that VoWLAN requires a minimum SNR of 25 dB throughout the coverage area. In an Ekahau post- deployment survey SNR heatmap, when the heatmap displays a consistent color indicating SNR at or above this threshold across the entire surveyed area -- including all rooms, corridors, and common areas such as the lobby -- the conclusion is that voice service is supported in all locations. The color coding in Ekahau's SNR heatmap uses green tones to indicate adequate SNR (typically 25 dB) and shifts toward yellow and red for degraded conditions. When the exhibit heatmap shows uniform adequate coverage across all surveyed areas without yellow or red zones, it confirms the SNR requirement for VoWLAN is universally met.
問題 #98
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
答案:B
解題說明:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick-walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP ' s signal but cannot hear each other - making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment. Reference:
WLSD Study Guide - RF Design Fundamentals, Hidden Node Problem, Transmit Power and Cell Size Optimization.
問題 #99
A consultant must design a WLAN for a large campus with high AP density, 50-100 clients per cell, 5 Mbps throughput per client minimum, 5 GHz and 2.4 GHz coverage at -67 dBm, and no
802.11b clients. Which two WLAN design approaches meet the requirements? (Choose two.)
答案:A,E
解題說明:
Designing for 50-100 clients per cell with 5 Mbps minimum throughput and no 802.11b clients requires two critical optimizations. First, setting minimum mandatory data rates to 12-18 Mbps (Option A) removes legacy lower data rates from the AP's supported rate set. When 1, 2, 5.5, and
11 Mbps rates are disabled and 12 Mbps becomes the minimum mandatory rate, clients that cannot achieve at least 12 Mbps are rejected from the cell, maintaining throughput standards.
Without this, a single 802.11b client operating at 1 Mbps can consume an inordinate share of airtime and reduce throughput for all other clients below the required minimum. Second, Flexible Radio Assignment (FRA) for 2.4 GHz reduction (Option D) is critical in high-density environments.
FRA allows the WLC to dynamically reassign some 2.4 GHz radios to 5 GHz operation or monitor mode, reducing 2.4 GHz cell size and interference while increasing 5 GHz capacity.
問題 #100
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