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| Section | Objectives |
|---|---|
| Topic 1: High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Topic 2: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 3: Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Mobility groups and roaming design - Controller-based architecture (WLC) |
| Topic 4: Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Physical environment assessment and constraints - Business and technical requirements gathering |
| Topic 5: RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| Topic 6: Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
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質問 # 89
An engineer is designing a wireless network for a small airport and completes the initial walkthrough phase of the facility. Which step of the WLAN site survey should the engineer perform next?
正解：D
解説：
The Cisco WLAN site survey methodology follows a structured, sequential process. The initial walkthrough -- sometimes called the discovery or orientation phase -- is the first step, during which the engineer physically tours the facility to understand its physical characteristics: building materials, structural layout, potential AP mounting locations, wiring closet positions, and environmental factors. After completing the initial walkthrough, the next logical phase is the predeployment survey (also referred to as a pre-deployment or predictive survey). The predeployment survey uses the information gathered during the walkthrough to create a detailed design plan -- either through a manual AP placement plan or a predictive survey tool such as Ekahau, where floor plans are annotated with materials and attenuation values and APs are virtually placed to model coverage. The predeployment survey output is the design document that drives the actual physical installation.
質問 # 90
An engineer must design AP placements for a new branch office that contains two floors. The engineer uses Ekahau to complete the predictive survey. To calculate the signal bleed through between floors, the engineer creates a building, adds the floors, and attenuation areas. After the scale is set, what else must be added on the floors to accurately measure the signal bleed at a specific location?
正解：C
解説：
In Ekahau Site Survey's multi-floor predictive modeling workflow, alignment points are the critical mechanism that allows the software to understand the precise vertical spatial relationship between floors in a multi-story building. Once floor plans are imported with their scale correctly defined, alignment points must be placed on each floor at the same real-world physical location -- such as a stairwell corner, elevator shaft, or structural column -- so that Ekahau can accurately calculate vertical signal propagation and inter-floor RF bleed. Without alignment points, the software has no spatial reference to determine which area on Floor 2 is directly above a given point on Floor 1, making floor-to-floor signal bleed calculations geometrically impossible.
質問 # 91
An engineer must assess an existing company WLAN to determine the possibility for future IEEE
802.11ac Wave 2 wireless deployment. All access switches are Fast Ethernet-capable only, and the wired infrastructure between existing APs and access switches is based on the CAT 6A standard. Which two actions provide maximum support of Cisco 3800 Series access points?
(Choose two.)
正解：A、D
解説：
Cisco 3800 Series APs support IEEE 802.11ac Wave 2, which can deliver throughput exceeding
1 Gbps. Fast Ethernet switches are limited to 100 Mbps per port, creating a severe bottleneck.
The two actions that provide maximum support are replacing with mGig switches (Option A) and replacing with gigabit switches with 10G uplinks (Option B). mGig (Multi-Gigabit Ethernet) switches support 2.5G and 5G speeds over existing CAT 6A cabling, allowing the full throughput of 802.11ac Wave 2 APs to be utilized without replacing the existing cable plant. Gigabit switches with 10G uplinks ensure that the access layer can support 1 Gbps per AP port while providing sufficient uplink capacity.
質問 # 92
A network engineer is preparing a predictive site survey for a new three-story office building before construction is complete. Which two inputs are required to produce an accurate predictive model? (Choose two.)
正解：B、C
解説：
A predictive survey builds an RF model mathematically rather than measuring live signal, so the accuracy of the output depends entirely on the accuracy of the model inputs. Scaled floor plans (Option B) are mandatory - the planning tool must know the true physical dimensions of the space to calculate free-space path loss and AP spacing. If the drawing scale is wrong, every calculated coverage cell is wrong. Wall and building material attenuation values (Option C) are the second required input, because RF propagation indoors is dominated by obstruction loss rather than free- space loss. Drywall, glass, concrete, brick, elevator shafts, and metal racking each attenuate differently, and these values must be applied to the walls drawn on the plan. Spectrum captures and association counts are impossible to collect in a building that has not been built, and AP serial numbers have no bearing on RF modeling.
質問 # 93
In an N+1 design, a customer needs certain APs in the emergency department to rejoin the backup controller before all other APs when a failover occurs. Which feature must the engineer include in the design?
正解：A
解説：
AP failover priority allows an engineer to assign each AP a priority level of low, medium, high, or critical. When a backup controller in an N+1 design receives more join requests than its licensed AP capacity allows, it uses these priority values to decide which APs to accept. If the controller is already at capacity and a higher-priority AP requests to join, the controller disassociates a lower- priority AP to make room for it. This makes AP failover priority the correct design element when specific coverage areas - such as an emergency department, operating theater, or warehouse safety zone - must be guaranteed service during a controller outage. AP fallback is a different feature that returns an AP to its primary controller once that controller comes back online, and it does not influence which APs are admitted during the failure. Mobility group priority and join profile weighting are not the mechanisms that govern controller admission during failover.
質問 # 94
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