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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mobility | 25% | - Optimize client roaming - Site Tags - Design mobility groups - Validate mobility tunneling |
| Topic 2: Wireless Site Survey | 25% | - Post-deployment site survey - Pre-deployment site survey - Collect design requirements and evaluate constraints - Layer 1 site survey analysis - Material attenuation and its design effects - Predictive site survey - Planning tools and network metrics evaluation |
| Topic 3: Wired and Wireless Infrastructure | 30% | - Design radio management - Physical infrastructure requirements - Design wireless bridging (mesh) - Logical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location |
| Topic 4: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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問題 #47
A university lecture hall has a Cisco wireless high-density network with this configuration: ?5 GHz only ?20-MHz channels ?UNII-1, UNII-2, and UNII-2E channels ?TPC minimum = 8 ?TPC maximum = 14 The lecture hall is 200 feet by 100 feet and has 16 Cisco APs that use directional antennas. Which feature must be included in the design to mitigate and reduce high-channel utilization from rogue APs?
答案：C
解題說明：
Receive Start of Packet (RxSOP) is a Cisco proprietary mechanism that defines the minimum received signal threshold at which an access point will acknowledge an 802.11 frame and begin processing it. In a high-density lecture hall environment with 16 APs and directional antennas on a constrained channel plan, rogue APs operating on the same or adjacent channels contribute directly to elevated channel utilization by causing unnecessary medium contention, virtual carrier sensing via NAV, and clear channel assessment deferral. By raising the RxSOP threshold on the legitimate APs, the engineer creates a higher signal floor requirement -- only signals above the configured RxSOP level are processed. Signals from distant rogue APs, arriving below this threshold, are silently discarded rather than processed, preventing them from consuming airtime through CCA deferral and NAV mechanisms.
問題 #48
A university wants to deploy a high density of APs in an area where a high number of users congregate.
Which functionality allows the university to optimize the RF settings for APs that operate in different environments or coverage zones?
答案：B
解題說明：
RF Profiles are a Cisco WLC configuration construct that allows administrators to define a customized set of Radio Resource Management (RRM) parameters and apply them to a subset of APs operating in a specific environment or coverage zone. Within a university high-density deployment - where a lecture hall, outdoor quad, cafeteria, and library may each require fundamentally different RF settings - RF Profiles enable differentiation without globally modifying all RRM parameters. An RF Profile can define custom values for:
minimum mandatory data rates, maximum transmit power, minimum transmit power, channel width (20/40
/80 MHz), RxSOP thresholds, client load balancing parameters, and coverage hole detection sensitivity. This allows the engineer to apply aggressive interference mitigation settings to high-density assembly areas while maintaining full-coverage settings for perimeter zones. AP Groups (Option A) assign WLANs and interface mappings to subsets of APs but do not directly control RF parameters. RF Groups (Option B) are automatically formed by RRM and represent a cluster of APs coordinating channel and power assignment. AP Profiles (Option C) define AP behavior parameters such as NTP and SSH settings, not RF optimization parameters. Reference: WLSD Study Guide - RF Profile Configuration, High-Density WLAN Design, RRM Parameter Customization.
問題 #49
An engineer is performing a passive survey report. The coverage heat map shows the entire site with all signal levels. To see only the desired coverage, which action must the engineer take?
答案：D
解題說明：
To focus the coverage heat map on the desired coverage threshold, the engineer should use the RSSI slider to set the heat map to the desired cutoff filter. This action adjusts the display to show only the signal levels that meet or exceed the specified RSSI value, effectively filtering out weaker signals and highlighting areas with sufficient coverage. In Ekahau and similar survey tools, the RSSI slider provides a dynamic way to set minimum signal thresholds, allowing the engineer to quickly validate whether coverage meets design targets such as -67 dBm for voice or -70 dBm for data. Changing the color scheme (Option A) only modifies the visual representation without filtering data. The RSSI calibration tool (Option B) adjusts how the tool perceives signal levels, not the display filter. Filtering by AP (Option D) would remove APs from the view, potentially hiding coverage gaps. Reference: WLSD Study Guide - Post-Deployment Survey, Ekahau Heat Map Tools, RSSI Coverage Filtering.
問題 #50
A customer requires the wireless network to perform real-time analysis to reduce congestion, link usage, and infrastructure upgrades. Which Cisco technology can accomplish this analysis?
答案：B
解題說明：
Cisco Application Visibility and Control (AVC) is a deep packet inspection and traffic classification framework integrated into the Cisco WLC and AP platform. AVC performs real-time analysis of wireless client traffic, classifying applications based on Layer 4-7 signatures using the NBAR2 (Network Based Application Recognition) engine. This provides the network administrator with granular visibility into exactly which applications are consuming bandwidth -- enabling data-driven decisions about network congestion remediation, link utilization management, and infrastructure investment planning. For example, AVC can reveal that a video streaming application is consuming 60% of available wireless bandwidth during peak hours, informing the decision to implement QoS rate limiting for that application class or upgrade the backhaul infrastructure. AVC also supports control functions through per-application QoS policies, rate limiting, and traffic shaping -- directly addressing congestion reduction.
問題 #51
A customer has a Cisco wireless network with two Cisco Catalyst 9800 Series WLCs in a high availability cluster, 50 Cisco 2800I APs, and all SSIDs and services are 5 GHz only. A security mandate requires that rogue APs be scanned and identified in 2.4 GHz and 5 GHz bands without impacting existing client connectivity. How must the wireless network be reconfigured to meet the requirement without purchasing additional APs?
答案：D
解題說明：
The Cisco Aironet 2800 Series APs feature a dual-radio architecture with a dedicated 5 GHz radio (slot 1) and a Flexible Radio Assignment (XOR) radio (slot 0) that can operate in either 2.4 GHz or 5 GHz, or be assigned to monitor mode for scanning functions. Since all existing SSIDs and services are 5 GHz only, the slot 1 (dedicated 5 GHz) radio is responsible for all current client connectivity -- it must remain in Client Serving mode to maintain uninterrupted 5 GHz WLAN service. The XOR radio (slot 0), currently either idle or operating as a secondary 5 GHz radio, can be repurposed without impacting client service. Setting the XOR radio to Monitor mode enables it to continuously scan all channels across both the 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. In Monitor mode, the XOR radio operates full-time as a dedicated scanner, providing rogue detection coverage on 2.4 GHz (previously uncovered since all services were 5 GHz) and supplementary scanning on 5 GHz.
This eliminates the need for additional dedicated monitor mode APs.
問題 #52
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