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| Section | Objectives |
|---|---|
| Topic 1: Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Business and technical requirements gathering - Physical environment assessment and constraints |
| Topic 2: Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
| Topic 3: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 4: Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| Topic 5: RF Fundamentals and Design Principles | - Channel planning and interference mitigation - RF behavior and propagation - Antenna types and placement strategies |
| Topic 6: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
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NEW QUESTION # 46
A network engineer is designing a wireless network to support high availability. The network will need to support the total number of APs and client SSO. Live services should continue to work without interruption during the failover. Which two requirements need to be incorporated into the design to meet these needs?
(Choose two.)
Answer: A,B
Explanation:
To support high availability with client SSO (Stateful Switchover) and no interruption to live services during failover, the design must incorporate two requirements. First, redundant WLCs (Option A) are essential - without a physical standby controller, there is no entity to take over when the primary WLC fails. In an SSO configuration, one WLC is active and one is standby, and the standby must be ready to assume the active role instantaneously. Second, the high availability pair requires one of the WLCs to have a valid AP count license (Option B). In a Cisco WLC SSO pair, the standby controller ' s AP count license applies when it becomes active - without a valid license on at least one WLC in the pair, APs cannot join after failover. A 10-second RTT maximum (Option C) is a latency requirement for the redundancy link but is not a primary design requirement that addresses the overall high availability architecture. A back-to-back direct connection (Option D) is one way to connect the redundancy ports but is not mandatory if a low-latency switch connection is used. Code version 7.5 or newer (Option E) is a requirement for specific legacy SSO platforms but not a general design principle. Reference: WLSD Study Guide - WLC SSO High Availability Design, AP License Requirements, Redundant Controller Architecture.
NEW QUESTION # 47
A wireless network consists of two IOS XE controllers installed in a data center, 9100 series APs, and a corporate and a guest WLAN. The customer must have a high availability pair of two Cisco WLCs for the client SSO. Which two design approaches must the engineer take to meet the requirement? (Choose two.)
Answer: B,C
Explanation:
Configuring a high availability SSO pair on Cisco Catalyst 9800 IOS XE WLCs has specific technical prerequisites that must be satisfied for the SSO relationship to form and function correctly. The two critical requirements are: each WLC must have a unique Redundancy Management Interface (RMI) IP address (Option B), and both WLCs must run identical IOS XE software versions (Option D). The Redundancy Management Interface is the dedicated in-band control channel over which the active and standby WLCs exchange state synchronization information, keepalive messages, and configuration updates. Each controller requires its own unique RMI IP address within the same subnet - the active uses one address and the standby uses another. If they shared the same RMI IP (Option C), there would be an IP address conflict preventing the interface from functioning. Identical software versions (Option D) are mandatory because the SSO state synchronization protocol and data structures must be version-compatible between the active and standby controllers. Any mismatch in IOS XE version will prevent SSO formation. License count (Option A) does not need to be identical for SSO. Service port IP addresses (Option E) must be unique per controller, not identical.
Reference: WLSD Study Guide - Catalyst 9800 SSO Prerequisites, Redundancy Management Interface Configuration, High Availability Pair Formation Requirements.
NEW QUESTION # 48
A wireless engineer must design a WLAN for a university that requires outdoor Wi-Fi access. Which obstruction has the greatest effect on wireless signal propagation?
Answer: D
Explanation:
In outdoor wireless deployments, foliage - particularly dense trees - represents the most significant and variable RF obstruction that engineers must account for during site survey and design. Trees are problematic for multiple compounding reasons: the high water content of living tissue causes signal absorption consistent with the principle that water is an effective absorber of 2.4 GHz and 5 GHz RF energy; the irregular branching structure causes multi-path scattering; and foliage density changes seasonally, meaning signal propagation characteristics measured during winter may differ substantially from summer readings when leaves are fully developed. A fully leafed deciduous tree can attenuate a 5 GHz signal by 6-15 dB depending on density and depth. Wind (Option A) causes only momentary mechanical movement of foliage and is not an obstruction itself. Rain (Option B) causes some absorption at higher frequencies but its effect at 2.4 GHz and
5 GHz in typical conditions is marginal compared to foliage. Poles (Option D) are thin structures with minimal RF impact. Outdoor surveys for university campuses must specifically account for tree locations, canopy density, and seasonal variation. Reference: WLSD Study Guide - Outdoor Wireless Design, Environmental RF Attenuation Factors, Outdoor Site Survey Considerations.
NEW QUESTION # 49
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
Answer: B
Explanation:
In Cisco's AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort -- it should only receive AP associations when all other options are exhausted.
Configuring the service/dev controller as the tertiary controller in the APs' preference configuration ensures exactly this behavior:
APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages.
NEW QUESTION # 50
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: B
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 # 51
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