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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Physical infrastructure requirements - Design wireless bridging (mesh) - Design radio management |
| Topic 2: Wireless Site Survey | 25% | - Material attenuation and its design effects - Planning tools and network metrics evaluation - Layer 1 site survey analysis - Collect design requirements and evaluate constraints - Post-deployment site survey - Predictive site survey - Pre-deployment site survey |
| Topic 3: Mobility | 25% | - Validate mobility tunneling - Site Tags - Optimize client roaming - Design mobility groups |
| Topic 4: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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質問 # 113
Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?
正解：C
解説：
In a high-availability configuration with multiple WLCs in a mobility group, when APs that only have a primary controller configured become orphaned (their primary WLC fails), they will by default join the controller with the lowest percentage of associated APs per license capacity. This load-based selection mechanism ensures a balanced distribution of APs across the remaining controllers in the mobility group. The WLC with the lowest percentage of AP capacity utilized is chosen because it has the most headroom to accept additional APs without becoming overloaded. This prevents a single backup controller from becoming overwhelmed while others remain underutilized. The selection is not based on absolute number of APs (Option D), available free licenses in absolute terms (Option A), or CPU utilization (Option C) - it specifically uses the percentage of license capacity occupied, which normalizes across controllers with different total AP capacities. Reference: WLSD Study Guide - N+1 Redundancy Default Behavior, AP Orphan Failover Logic, WLC Load-Based AP Assignment.
質問 # 114
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?
Exhibit - Q15: Ekahau SNR Heatmap - Post-Deployment Survey Output
正解：D
解説：
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. Options A, B, and C suggest partial or no coverage, which would be indicated by mixed or poor SNR values - conditions not present in this scenario. The post-deployment survey with Ekahau is the validation step confirming that the predictive design was accurately realized in the physical environment. Reference: WLSD Study Guide - VoWLAN Design Requirements, SNR Thresholds, Post-Deployment Survey Validation with Ekahau.
質問 # 115
An enterprise is using two wireless controllers to support the wireless network. The data centre is located in the head office. Each controller has a corporate WLAN configured with different SSID names. The APs are installed using a round-robin approach to load balance the traffic. What should be changed in the configuration to optimize roaming?
正解：D
解説：
To optimize roaming in a wireless network with multiple controllers, it is essential to use the same WLAN name (SSID) across all controllers. When SSIDs differ between controllers, clients perceive them as different networks and must perform a full re-association and re-authentication when roaming between APs managed by different controllers. This causes a roaming disruption equivalent to connecting to an entirely new network. By using identical SSID names on both controllers, clients can seamlessly roam between APs on different controllers within the same mobility group -- the controllers exchange client state information via the mobility tunnel, enabling seamless handoff. In the scenario described, 'Copr-NET390595865WLC-1' and 'Copr- NET6837l638WLC-2' are different SSIDs, meaning clients cannot roam transparently between them. Making both controllers broadcast the same SSID name (and using a mobility group to connect the controllers) resolves this.
質問 # 116
A wireless engineer is using Ekahau Site Survey to validate that an existing wireless network is operating as expected. A Cisco CleanAir AP is used for Layer 1 survey by using Metageek Chanalyzer only on the current operating channel. Which operating mode is configured for the Cisco CleanAir AP?
正解：D
解説：
When using Metageek Chanalyzer in conjunction with a Cisco CleanAir-capable AP for Layer 1 spectrum analysis, the AP must be configured in SE-Connect mode (Spectrum Expert Connect). SE-Connect mode enables the AP ' s CleanAir radio to operate as a dedicated spectrum analyzer, feeding raw spectrum data to the connected Chanalyzer software for visualization and analysis. In this mode, the AP does not serve any Wi- Fi clients and instead focuses all radio resources on spectrum scanning. Metageek Chanalyzer uses the SE- Connect mode specifically to receive the CleanAir ASIC ' s spectrum analysis data. Local mode (Option A) serves clients normally, only providing periodic CleanAir reports. Sniffer mode (Option B) captures 802.11 frames for protocol analysis and does not provide raw spectrum data to Chanalyzer. Monitor mode (Option C) performs WIDS scanning and RRM measurements but does not support the direct Chanalyzer integration. SE- Connect is the specific mode that enables external spectrum analysis software to use the CleanAir ASIC ' s spectrum data in real time. Reference: WLSD Study Guide - Cisco CleanAir Technology, AP Operating Modes, SE-Connect Mode for Spectrum Analysis.
質問 # 117
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco
9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
正解：B
解説：
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command ' wireless mobility mac-address < MAC > ' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming. Option A configures the HA interface for SSO synchronization but not for AireOS mobility interoperability. Option B sets a default gateway. Option D enables management gateway failover, unrelated to mobility peer identification. Reference: WLSD Study Guide - IOS XE WLC SSO Configuration, AireOS to 9800 Migration, Mobility Peer MAC Address Management.
質問 # 118
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