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| Section | Objectives |
|---|---|
| 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 Security Design | - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
| Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Coverage and capacity planning - Physical environment assessment and constraints |
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NEW QUESTION # 100
A wireless engineer must design a backhaul link. The engineer has a mesh access point that has a wired connection back to the infrastructure. What must be changed in the AP role before a change is made in the AP mode?
Answer: D
Explanation:
In Cisco mesh networking architecture, access points are classified into two primary roles: Root Access Points (RAP) and Mesh Access Points (MAP). A RAP is an access point that maintains a wired Ethernet backhaul connection back to the network infrastructure, while a MAP operates wirelessly, relying on mesh backlinks to upstream RAPs. When an engineer needs to change an AP mode -- such as switching to bridge mode to extend the mesh -- the AP role must first be defined correctly. The AP must be designated as a RAP before any mode-level configuration changes are applied. This sequencing is critical because the AP role defines the fundamental backhaul path; changing the mode without first establishing the role results in misconfiguration and potential connectivity loss. The RAP communicates directly with the wired infrastructure via its Ethernet port, making it the gateway for all downstream MAPs in the mesh topology.
NEW QUESTION # 101
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?
Answer: B
Explanation:
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.
NEW QUESTION # 102
An engineer is designing a point-to-point outdoor bridge link spanning 4 km between two buildings. Which two factors must be calculated during the design? (Choose two.)
Answer: B,D
Explanation:
An outdoor bridge link is fundamentally an RF engineering problem, and two calculations determine whether the link will work. Fresnel zone clearance (Option A) accounts for the ellipsoidal volume around the direct line of sight through which most of the RF energy travels; obstructions intruding into this zone cause diffraction loss even when visual line of sight appears clear. Cisco's design guidance is to maintain at least 60% of the first Fresnel zone free of obstruction, which at 4 km requires meaningful antenna height above terrain, buildings, and tree lines. The link budget (Option C) sums transmit power, antenna gain at both ends, cable and connector losses, and free-space path loss, then compares the result against receiver sensitivity for the desired data rate - with adequate fade margin, typically 10 to 20 dB, to survive rain and multipath. Mobility group names, DHCP scoping, and MTU are network configuration details that do not determine whether the RF link closes.
NEW QUESTION # 103
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?
Answer: A
Explanation:
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. A post-deployment survey (Option A) validates coverage after installation - it cannot precede deployment. Active and passive surveys (Options B and D) are physical measurement techniques conducted either pre-deployment (with temporary APs) or post-deployment (with installed APs) - they do not logically follow immediately after a walkthrough before any design work is done. Reference: WLSD Study Guide - WLAN Site Survey Process, Predeployment Survey Phase, Airport Wireless Design Considerations.
NEW QUESTION # 104
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?
Answer: A
Explanation:
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.
NEW QUESTION # 105
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