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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design radio management - Physical infrastructure requirements - Logical infrastructure requirements - Design wireless bridging (mesh) - Design for data, voice, video, location |
| Topic 2: Wireless Site Survey | 25% | - Post-deployment site survey - Predictive site survey - Planning tools and network metrics evaluation - Pre-deployment site survey - Collect design requirements and evaluate constraints - Material attenuation and its design effects - Layer 1 site survey analysis |
| Topic 3: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Topic 4: Mobility | 25% | - Site Tags - Validate mobility tunneling - Optimize client roaming - Design mobility groups |
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14. Frage
A conference center is designing a Wi-Fi 6 deployment for a room holding 2000 attendees, most of whom will use low-bandwidth applications. Which Wi-Fi 6 capability most directly improves efficiency in this scenario?
Antwort: A
Begründung:
The defining problem in a high-density room with many low-bandwidth clients is not raw per-client throughput but the overhead of medium contention - under 802.11ac, each small packet requires a full channel access cycle, so the channel spends most of its airtime on contention and preamble rather than payload. OFDMA divides the channel into resource units so the AP can serve multiple clients within a single transmit opportunity, dramatically reducing per-frame overhead when the traffic mix is many small transmissions. This is precisely the profile of a conference audience running chat, email, and browsing. 1024-QAM raises peak modulation but only benefits clients already at very high signal levels and does nothing for contention. 160 MHz channel bonding is counterproductive in high density because it collapses the number of reusable channels. Target Wake Time improves client battery life by scheduling wake intervals, which is valuable for IoT but does not address the airtime efficiency problem in this design.
15. Frage
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?
Antwort: A
Begründung:
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.
16. Frage
A customer wants to provide wireless coverage in a parking lot outside of a building. An engineer determines that three APs are required. The APs can be mounted on the light poles in the parking lot because there are cable routes already in place for these locations. The closest wiring closet is approximately 200 meters away.
Which setup powers and connects the APs back to the customer network?
Antwort: A
Begründung:
This question hinges on a fundamental network engineering constraint: the maximum transmission distance of copper Ethernet cabling. IEEE 802.3 standards specify a maximum segment length of 100 meters (328 feet) for all standard PoE and Ethernet over Category 5e, 6, or 6A UTP copper cabling. The parking lot light poles are approximately 200 meters from the closest wiring closet - more than double the maximum copper distance. This immediately eliminates Options A and D, which specify Category 6 UTP cabling: at 200 meters, UTP copper cannot reliably carry Ethernet at any supported speed, and PoE cannot be delivered over this distance regardless of standard. The correct solution is fiber optic connectivity between the wiring closet and the parking lot, combined with a local AC/DC power module at each pole location. Fiber optic cabling supports single-mode runs of kilometers and multi-mode runs of hundreds of meters at Gigabit speeds - easily spanning 200 meters. At the AP mounting location on the light pole, an AC/DC power module (powered from the pole ' s existing electrical supply) converts AC power to the DC power the AP requires.
Option B (fiber with 802.3af) is incorrect because PoE cannot be delivered over fiber - 802.3af requires copper cabling for simultaneous power and data delivery. Reference: WLSD Study Guide - Outdoor AP Deployment, Fiber vs. Copper Distance Limitations, Outdoor Power Solutions.
17. Frage
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?
Antwort: C
Begründung:
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.
18. Frage
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?
Antwort: C
Begründung:
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.
19. Frage
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