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| Section | Objectives |
|---|---|
| Cisco Wireless Architecture | - Mobility groups and roaming design - Controller-based architecture (WLC) - Lightweight Access Point (LAP) deployment models |
| Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| RF Fundamentals and Design Principles | - RF behavior and propagation - Antenna types and placement strategies - Channel planning and interference mitigation |
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NEW QUESTION # 101
A customer has a single anchor WLC named Anchor A. Anchor A is in a DMZ and provides guest access.
The customer wants to deploy an additional anchor controller named Anchor B to provide redundancy if Anchor A fails. Which design approach should be taken for the guest WLAN priority on the foreign WLC for each anchor WLC?
Answer: B
Explanation:
In a wireless network design where anchor redundancy is required for guest access, setting different priorities for the anchor controllers ensures deterministic primary and backup behavior. Cisco anchor priority uses a lower numerical value to indicate higher preference - Priority 1 is the highest priority (most preferred) anchor, and Priority 3 is lower priority. Setting Anchor A to priority 1 (Option D) makes it the primary anchor controller - all new guest client sessions will preferentially anchor to Anchor A. Setting Anchor B to priority
3 makes it the standby anchor - guest clients will only be anchored to Anchor B when Anchor A is unavailable. This creates a clear primary/backup relationship with deterministic failover. Setting both anchors to the same priority (Options A and C) would result in load balancing between the two anchors rather than active/standby behavior. Option B incorrectly reverses the priorities, making Anchor B the primary and Anchor A the backup. Reference: WLSD Study Guide - Guest Anchor Redundancy Design, Anchor Priority Configuration, DMZ Anchor WLC Architecture.
NEW QUESTION # 102
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: A
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 # 103
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
Answer: A
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non-Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions. Wireless intrusion prevention (Option B) detects rogue APs and 802.11 attacks but not Layer 1 RF noise. Wireshark (Option C) is a packet capture tool for Layer 2-7 analysis and cannot detect non-Wi-Fi RF energy. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Post- Deployment Survey, Non-Wi-Fi Interference Identification.
NEW QUESTION # 104
During a validation survey of a newly deployed WLAN, the engineer measures -70 dBm at the cell edge on a data-only WLAN, but the noise floor is -78 dBm. Which conclusion should the engineer reach?
Answer: D
Explanation:
Signal strength alone is an incomplete measure of coverage quality - what determines whether a client can demodulate a frame is how far the signal rises above the surrounding noise. Here the received signal is -70 dBm and the noise floor is -78 dBm, giving a signal-to-noise ratio of only 8 dB. A data WLAN requires a minimum SNR of approximately 20 dB, and voice requires 25 dB, so this location fails validation despite an RSSI value that would otherwise appear acceptable. An elevated noise floor of -78 dBm also points to a non-Wi-Fi interference source or excessive co- channel activity that spectrum analysis should identify, since a clean environment typically sits closer to -90 dBm. The remediation is to address the noise source or increase signal strength through AP placement, not to accept the reading because one of the two metrics passes.
Requiring -60 dBm across all WLANs is far stricter than any Cisco design guidance and would produce an unnecessarily dense and expensive deployment.
NEW QUESTION # 105
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: A
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 # 106
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