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| Section | Weight | Objectives |
|---|---|---|
| Wireless Site Survey | 25% | - Pre-deployment survey and validation - Design requirements collection and constraint evaluation
- RF propagation and attenuation analysis |
| Mobility Design | 25% | - Roaming optimization
|
| Wireless Infrastructure Design | 30% | - Wired-wireless integration design
|
| WLAN High Availability and Security Design | 20% | - Management and monitoring design - High availability design
|
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NEW QUESTION # 113
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs. To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
Answer: C
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment). This tunneling adds encapsulation overhead -- CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor.
Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping -- reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead.
NEW QUESTION # 114
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.
NEW QUESTION # 115
An engineer must perform a predictive wireless survey to indicate the number of access points required. The engineer has created a new project and imported the floor plan. Which step must be taken next for accurate AP placement?
Answer: A
Explanation:
After creating a new predictive survey project and importing the floor plan, the next mandatory step is to set the scale of the floor plan. Setting the scale is critical because all subsequent measurements - AP coverage radius, cell overlap calculations, and distance-based attenuation modeling - depend on the accuracy of the floor plan ' s physical dimensions. If the scale is incorrect, the predictive model will place APs at incorrect distances relative to each other and produce inaccurate coverage predictions. The scale is typically set by the engineer clicking on two known points on the floor plan and entering the real-world distance between them, calibrating the software ' s measurement system. Analyzing the network (Option A) and placing APs (Option C) come after the scale is established. Identifying the coverage area (Option B) is often done simultaneously with scale setting or immediately after. Setting the scale first ensures all subsequent work is based on accurate physical dimensions. Reference: WLSD Study Guide - Ekahau Predictive Survey Workflow, Floor Plan Import and Scale Setting, Pre-Deployment Survey Methodology.
NEW QUESTION # 116
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. Options A (monitor), C (bridge), and D (local) refer to AP modes, not roles, and cannot be configured until the role is properly defined.
Reference: WLSD Study Guide - Mesh Networking Fundamentals, Outdoor Wireless Design, AP Role and Mode Configuration.
NEW QUESTION # 117
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.
NEW QUESTION # 118
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