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| Section | Objectives |
|---|---|
| Wireless Security Design | - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) - Mobility groups and roaming design |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
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질문 # 77
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?
정답：D
설명：
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 therefore: 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. Reference: WLSD Study Guide - High-Density WLAN Capacity Planning, Per-User Throughput Calculation, Channel Planning and Spatial Reuse.
질문 # 78
An engineer must reduce roaming delay for wireless medical carts running a real-time application on an 802.1X-secured WLAN. Which feature should be included in the design to eliminate the full reauthentication on each roam?
정답：D
설명：
On an 802.1X/WPA2-Enterprise WLAN, a standard roam requires the client to complete a full EAP exchange with the authentication server plus a four-way handshake, which typically takes hundreds of milliseconds and is enough to break a real-time session. 802.11r Fast Transition solves this by caching the master key material and pre-establishing the key hierarchy so the client can complete the roam with an abbreviated exchange, reducing roam time to well under 50 ms.
This is the only option in the list that eliminates the reauthentication itself. 802.11k assists roaming by providing the client a neighbor report so it does not have to scan every channel to find candidate APs, and 802.11v allows the infrastructure to steer a client toward a better AP - both reduce the time spent deciding where to roam, but neither shortens the authentication exchange once the target AP is chosen. Aironet IE carries Cisco-specific information elements and is unrelated to fast roaming key handling.
질문 # 79
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?
정답：A
설명：
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).
질문 # 80
An engineer is designing a wireless solution for a corporate campus which includes two primary buildings:
Research and Operations. The design must ensure seamless mobility for employees moving between buildings, support uninterrupted connectivity for real-time applications, and facilitate efficient Layer 2 and Layer 3 roaming. Each building ' s 9800-80 WLC manages its local APs, and the solution must support 802.11 r/k/v while maintaining an effective mobility control plane. Which design approach leverages Cisco mobility group architecture to meet the requirements?
정답：D
설명：
Cisco ' s mobility group architecture enables seamless client roaming between WLCs by establishing a trusted peer relationship and shared mobility domain. When two Cisco Catalyst 9800-80 WLCs are placed in the same mobility group, they establish CAPWAP mobility tunnels enabling both Layer 2 and Layer 3 roaming with session continuity including IP address preservation. Within the same mobility group, WLCs exchange client state information, allowing 802.11r Fast BSS Transition, 802.11k neighbor reports, and 802.11v BSS Transition Management to function across controller boundaries. No specific primary or secondary roles are assigned within a mobility group - all members are peers with equal standing for roaming purposes, which is precisely what Option D describes. Option A incorrectly implies a hierarchical structure that does not exist in mobility group peer relationships. Option B separating the WLCs into different groups would break inter- building roaming since clients would experience a full re-authentication cycle. Option C imposing an anchor relationship is appropriate only for guest WLANs. Reference: WLSD Study Guide - Mobility Group Architecture, Inter-Controller Roaming, 802.11r/k/v Fast Roaming Design.
질문 # 81
An engineer must perform a predictive design for a wireless network.
The customer has devices that can tolerate at most 100 ms of delay when roaming. Which design criteria must be used?
정답：C
설명：
Devices that can tolerate at most 100 ms of delay when roaming are voice devices. The 100 ms maximum roaming delay threshold is the Cisco-specified design criterion for VoWLAN implementations -- it defines the maximum time a handset can tolerate being disconnected from the wireless network during a roam event before the voice call is degraded or dropped. This threshold drives specific design requirements: 15-20% cell overlap at -67 dBm, fast roaming mechanisms (802.11r, CCKM, or OKC), and AP placement along user movement paths.
질문 # 82
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