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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability and Security Design | 20% | - High availability design
|
| Wireless Infrastructure Design | 30% | - Wired-wireless integration design
|
| Mobility Design | 25% | - Guest mobility and BYOD design - Roaming optimization
|
| 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 #26
A wireless consultant must design a Cisco WLAN. The consultant recommends a solution that requires 12 Cisco 9100 Series APs connected to a Cisco 3800 Series PoE+ switch. Each AP requires PoE+ for full functionality. What is the total PoE requirement in watts?
答案:D
解題說明:
This question requires a straightforward PoE power budget calculation. The IEEE 802.3at standard (PoE+) delivers a maximum of 30W at the Power Sourcing Equipment (PSE/switch port). Cisco 9100 Series access points such as the C9120, C9130, and C9136 are designed to operate with full functionality using PoE+ at
30W per AP. The total PoE power requirement for 12 APs is calculated as: 12 APs × 30W per AP = 360W.
This figure represents the total power draw that the Cisco 3800 Series PoE+ switch must be capable of supplying across the connected AP ports simultaneously. The Cisco Catalyst 3800 Series switches offer a total PoE power budget that must be validated against this 360W requirement during the design phase. Note that some Cisco 9100 APs support higher power modes through IEEE 802.3bt (PoE++), which can provide up to
90W - but the question specifies PoE+ (802.3at) for the switch infrastructure, making 30W × 12 = 360W the correct answer. Option D (720W) would correspond to 24 APs at 30W each. Option B (1080W) would represent 36 APs. Option C (184.8W) corresponds to a non-standard per-AP power value. Reference: WLSD Study Guide - PoE Power Budget Planning, Cisco 9100 Series AP Power Requirements, Wired Infrastructure Design for Wireless Deployments.
問題 #27
A network engineer is deploying Cisco 9130I APs on multiple Cisco Catalyst 9800-80 WLCs with Cisco Catalyst Center. The engineer must enable Cisco AI Analytics and location analytics to use the RRM features to automatically manage the WLC RF profiles. Which type of license must be used on Cisco Catalyst Center?
答案:D
解題說明:
Cisco Catalyst Center ' s AI-driven network management capabilities - including AI Analytics, AI-Enhanced RRM (Radio Resource Management), location analytics (DNA Spaces integration), and automated RF profile management - are exclusively available under the Catalyst Advantage license tier. The Advantage tier builds upon the Essentials tier and adds access to the full suite of AI/ML-powered assurance and optimization features. Specifically, AI-Enhanced RRM leverages machine learning models trained on historical RF telemetry to predict and prevent RF issues, dynamically adjust channel and power assignments, and automate RF profile selection - capabilities that cannot be activated without the Advantage license. Location analytics through Catalyst Center integrates with Cisco Spaces to provide real-time client location tracking, asset tracking, and spatial analytics. Catalyst Essentials (Option C) provides basic device management, software image management, and network plug-and-play provisioning - it does not include AI Analytics or advanced RRM automation. Right-To-Use (Option B) is a legacy licensing model not applicable to Catalyst Center.
SNTC SmartNet (Option D) is a support and maintenance contract, not a software feature license. Reference:
WLSD Study Guide - Cisco Catalyst Center Licensing, AI-Enhanced RRM, Catalyst Advantage Feature Set.
問題 #28
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs. To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
答案:A
解題說明:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment). This tunneling adds encapsulation overhead -- CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor.
Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping -- reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead.
問題 #29
An engineer must design and configure a wireless network for pervasive coverage in an oil terminal, casual web and email traffic, 5 GHz. What is the best design?
答案:D
解題說明:
An oil terminal presents specific wireless design constraints: the requirement is pervasive coverage (maximum geographic coverage) for low-bandwidth applications (casual web and email). These requirements prioritize coverage reach over throughput optimization. The correct approach is to keep all data rates enabled, including lower rates such as 6, 9, 12, and 18 Mbps - because in an industrial environment with challenging RF propagation paths, reflective surfaces, and potential obstructions, lower data rates extend the functional coverage range of each AP. Web and email traffic does not require high data rates; even 1-6 Mbps is sufficient for these applications. Disabling rates below 54 Mbps (Option A) would dramatically shrink each AP ' s effective coverage area, requiring many more APs for pervasive coverage and failing the primary design objective. Assigning static maximum power without RRM auto-adjustment creates excessive co- channel interference. Disabling rates below 24 Mbps (Option C) still reduces coverage reach unnecessarily.
Disabling 802.11n and 802.11ac MCS rates (Option D) prevents the AP from using high-efficiency modulation for nearby clients without coverage benefit. Auto power assignment combined with all rates enabled provides the optimal balance for pervasive industrial deployment. Reference: WLSD Study Guide - Industrial WLAN Design, Coverage vs. Capacity Trade-offs, Data Rate Configuration for Pervasive Coverage.
問題 #30
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?
答案:A
解題說明:
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.
問題 #31
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