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| Section | Objectives |
|---|---|
| RF Fundamentals and Design Principles | - RF behavior and propagation - Antenna types and placement strategies - Channel planning and interference mitigation |
| Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Physical environment assessment and constraints - Business and technical requirements gathering |
| Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
| Wireless Security Design | - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
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NEW QUESTION # 95
Which strategies must the engineer use for the antenna deployment model in a warehouse?
Answer: B
Explanation:
Warehouse wireless deployments present unique RF engineering challenges: extremely high ceilings (often 25-45 feet), dense metallic shelving systems that create specular reflections and RF shadows, narrow aisles between rack systems, and the need to cover linear travel paths for RF scanner devices. The recommended Cisco antenna strategy for warehouses is wall-mounted patch (directional) antennas. Patch antennas provide a forward-facing radiation pattern that can be aimed precisely down warehouse aisles, delivering concentrated RF energy where RF scanners actually operate -- in the aisles between shelving -- rather than dispersing energy into metallic shelving structures. Wall mounting at intermediate height (typically 10-15 feet on aisle- end walls) places the antenna at a height that aligns the main lobe with the working zone of handheld scanners.
NEW QUESTION # 96
A network engineer is configuring high availability on an access point. What is the maximum number of controllers that can be configured?
Answer: D
Explanation:
When configuring high availability on a Cisco access point, the AP can be configured with a maximum of three controllers: a primary controller, a secondary controller, and a tertiary controller. This three-tier hierarchy defines the failover order - the AP first attempts to join its primary controller, then the secondary if the primary is unavailable, and finally the tertiary if both the primary and secondary are unreachable. After exhausting all three configured options, the AP enters a discovery process to find any available controller.
This three-controller configuration (primary, secondary, tertiary) allows network engineers to implement N+1 redundancy where critical APs can be directed to specific backup controllers in a deliberate sequence.
Limiting the configuration to only 2 controllers (as stated in Option B which would be incorrect) would reduce redundancy options for environments with geographically distributed controllers requiring specific failover paths. Reference: WLSD Study Guide - AP High Availability Configuration, Primary/Secondary
/Tertiary Controller Assignment, AP Failover Design.
NEW QUESTION # 97
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment.
Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
Answer: C,D
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D).
UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic -- both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function.
NEW QUESTION # 98
An engineer is performing an AP-on-a-stick survey and finds that the 5 GHz channel overlap is too high when an appropriate number of APs are used for the density requirements. Which two actions during the survey reduce channel overlap? (Choose two.)
Answer: A,D
Explanation:
Raising the minimum data rate to 24 Mbps reduces the effective coverage range of each AP because clients at the cell edge operating at low data rates are effectively excluded from the cell. This shrinks cell size, reducing channel overlap between neighboring APs on the same channel. Using directional antennas limits the coverage area of some APs by focusing RF energy in specific directions rather than radiating omnidirectionally, which directly reduces the lateral overlap between adjacent APs. Increasing AP transmit power (Option B) would worsen overlap, not reduce it. Allowing UNII-2e channels (Option C) provides more channel options but does not reduce the physical cell overlap - it only provides more channels to avoid co- channel interference. Power saving mode (Option E) is a client-side power management feature unrelated to AP cell sizing during a survey. Reference: WLSD Study Guide - Channel Overlap Mitigation, Data Rate Configuration, Directional Antenna Use Cases.
NEW QUESTION # 99
What causes the most signal attenuation based on the wireless design tools?
Answer: A
Explanation:
Metal doors cause the most signal attenuation among common building materials due to the fundamental electromagnetic properties of metal. Metal is highly reflective and absorptive of radio frequency signals - it creates what is effectively a Faraday cage effect around any room or space it encloses. In wireless design attenuation modeling tools such as Ekahau, metal is assigned the highest attenuation value among standard building materials, typically 30+ dB per surface. Cinder block walls (Option A) are dense and provide significant attenuation (10-15 dB) but are not as RF-impenetrable as solid metal. Glass walls (Option C) and office windows (Option D) have relatively low attenuation values (2-4 dB) due to the minimal RF-absorbing properties of glass. When engineers model attenuation materials in predictive survey tools, metal doors and metal-containing structures consistently produce the highest per-surface attenuation values, making them the primary barrier obstacles to plan around. Reference: WLSD Study Guide - RF Signal Attenuation, Building Material Attenuation Values, Predictive Survey Material Modeling.
NEW QUESTION # 100
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