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| Section | Objectives |
|---|---|
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Business and technical requirements gathering - Coverage and capacity planning |
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| RF Fundamentals and Design Principles | - Channel planning and interference mitigation - RF behavior and propagation - Antenna types and placement strategies |
| High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
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NEW QUESTION # 103
A stadium deployment requires maximum channel reuse across 300 APs in the 5 GHz band.
Which channel design should the engineer specify?
Answer: C
Explanation:
In very high density environments, the dominant design constraint is the number of unique non- overlapping channels available for reuse, not the peak throughput of any single client. A 20 MHz channel width yields the largest number of distinct channels, which minimizes co-channel interference between the tightly spaced APs a stadium requires. Enabling DFS channels adds the UNII-2 and UNII-2 Extended bands, roughly doubling the available channel count in most regulatory domains and further improving the reuse pattern. Widening the channel to 40, 80, or
160 MHz has the opposite effect - each doubling of channel width halves the number of available channels, so an 80 MHz plan in a 300-AP venue guarantees that many APs share the same channel and contend for the same airtime. Disabling DFS or excluding UNII-2 discards channels the design cannot afford to lose.
NEW QUESTION # 104
A customer has two Cisco wireless controllers named WLC-A and WLC-B. Each controller is in a different building on a campus. The WLCs have different Layer 3 interfaces and broadcast the same SSIDs from their respective APs. Users must remain connected to the same VLAN and maintain their IP addresses during roaming from the APs attached to WLC-A and WLC-B. Which action accomplishes the requirement?
Answer: B
Explanation:
The requirement for users to retain their VLAN assignment and IP address when roaming between buildings managed by different WLCs is a Layer 3 roaming scenario. In Cisco ' s wireless architecture, IP address preservation across controller boundaries is achieved through inter-controller mobility - specifically the foreign-anchor mobility tunnel mechanism. When a client roams from Building A (WLC-A) to Building B (WLC-B), WLC-B becomes the foreign controller and WLC-A becomes the anchor controller. WLC-B tunnels the client ' s traffic back to WLC-A, allowing the client to retain its original IP address even while physically associated to an AP managed by WLC-B. This requires creating a mobility group between WLC-A and WLC-B with both controllers configured with the same mobility group name - the group name is the trust identifier that permits the mobility tunnel and anchor-foreign relationship to form. An SSO cluster (Option B) creates redundancy between two WLCs operating as one logical entity, not inter-building roaming between independent controllers. 802.11r (Option C) accelerates re-association but does not preserve IP addresses across different Layer 3 subnets. AP groups (Option D) control SSID and VLAN assignments but do not enable inter-controller IP preservation. Reference: WLSD Study Guide - Inter-Controller Mobility, Layer 3 Roaming, IP Address Preservation.
NEW QUESTION # 105
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: D
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. Setting matching MTUs (Option A) does not prevent fragmentation if the effective tunnel MTU is lower than the client segment size. Increasing the MTU (Option B) is often constrained by physical infrastructure. Setting the DF bit (Option D) would cause packets to be dropped rather than fragmented.
Reference: WLSD Study Guide - Anchored WLAN Design, CAPWAP Mobility Tunnel MTU, TCP MSS Clamping.
NEW QUESTION # 106
Which profile is included within a site tag when configured in a Cisco 9800 WLC architecture?
Answer: C
Explanation:
The Cisco Catalyst 9800 IOS XE WLC uses a tag-based configuration architecture. Three primary tag types are used: site tags, policy tags, and RF tags. The site tag associates an AP with its operational context and contains two specific profile references: the AP join profile (defining AP-level parameters such as NTP, syslog, SSH, LED behavior, and CAPWAP timers) and the flex profile (defining FlexConnect-specific parameters including locally switched VLANs, split tunneling, local authentication settings, and VLAN-ACL mappings). The flex profile within the site tag enables the AP to operate in FlexConnect mode with locally configured switching behavior when WLC connectivity is lost.
NEW QUESTION # 107
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: D
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 # 108
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