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| Section | Objectives |
|---|---|
| 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 |
| Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) - Mobility groups and roaming design |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
| Wireless Security Design | - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Business and technical requirements gathering - Coverage and capacity planning |
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NEW QUESTION # 57
A customer has a Cisco wireless network with two Cisco Catalyst 9800 Series WLCs in a high availability cluster, 50 Cisco 2800I APs, and all SSIDs and services are 5 GHz only. A security mandate requires that rogue APs be scanned and identified in 2.4 GHz and 5 GHz bands without impacting existing client connectivity. How must the wireless network be reconfigured to meet the requirement without purchasing additional APs?
Answer: D
Explanation:
The Cisco Aironet 2800 Series APs feature a dual-radio architecture with a dedicated 5 GHz radio (slot 1) and a Flexible Radio Assignment (XOR) radio (slot 0) that can operate in either 2.4 GHz or 5 GHz, or be assigned to monitor mode for scanning functions. Since all existing SSIDs and services are 5 GHz only, the slot 1 (dedicated 5 GHz) radio is responsible for all current client connectivity -- it must remain in Client Serving mode to maintain uninterrupted 5 GHz WLAN service. The XOR radio (slot 0), currently either idle or operating as a secondary 5 GHz radio, can be repurposed without impacting client service. Setting the XOR radio to Monitor mode enables it to continuously scan all channels across both the 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. In Monitor mode, the XOR radio operates full-time as a dedicated scanner, providing rogue detection coverage on 2.4 GHz (previously uncovered since all services were 5 GHz) and supplementary scanning on 5 GHz.
This eliminates the need for additional dedicated monitor mode APs.
NEW QUESTION # 58
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: B
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 # 59
A company is upgrading its wireless infrastructure and is in a state of transition. Some parts of the company's building still run on the legacy WLC. The new WLC is not located at the same site as the legacy WLC. The company requires seamless client inter-controller roaming between the new WLC and the legacy WLC, with no disruptions. Both WLCs are separated by firewalls. Which troubleshooting command validates that the mobility control packets between the WLCs can be sent and received?
Answer: B
Explanation:
The command 'debug mobility handoff enable' is used to validate the mobility control packets between Wireless LAN Controllers (WLCs). This command enables debugging of the handoff process, which is critical for ensuring seamless client roaming between controllers. When WLCs are separated by firewalls, it is essential to confirm that mobility control packets can traverse these firewalls without being dropped or rejected. The 'debug mobility handoff enable' command allows network administrators to monitor the handoff process in real time and identify whether mobility PDUs are being exchanged successfully. If mobility control packets are being blocked by the firewall, this debug output will show failures in the handoff sequence. This command directly validates bidirectional mobility traffic flow, making it the correct troubleshooting tool for the scenario described.
NEW QUESTION # 60
A school deploys a Cisco wireless infrastructure in its classrooms to support a high density of mobile devices. The network administrator wants to bond channels in groups of two and only allow APs to send 802.11 management frames at 24 Mbps. What should be included in the design to accomplish this objective?
Answer: C
Explanation:
For a high-density classroom deployment using 5 GHz with channel bonding in groups of two (40 MHz channels), the correct configuration is to set the channel width for 802.11a (5 GHz) to 40 MHz and set the 24 Mbps data rate to Mandatory. Channel bonding refers to combining two adjacent 20 MHz channels into a single 40 MHz channel, doubling the channel width. Since the requirement specifies 5 GHz operation (where high-density design is appropriate), this must be applied to the 802.11a radio profile, not 802.11b (which operates only on 2.4 GHz). Setting 24 Mbps as Mandatory ensures that APs transmit management frames (beacons, probe responses, and other control frames) only at 24 Mbps -- this is how the 'only allow APs to send 802.11 management frames at 24 Mbps' requirement is implemented.
NEW QUESTION # 61
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: C
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 # 62
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