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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wireless Site Survey | 25% | - Layer 1 site survey analysis - Predictive site survey - Planning tools and network metrics evaluation - Pre-deployment site survey - Post-deployment site survey - Collect design requirements and evaluate constraints - Material attenuation and its design effects |
| Mobility | 25% | - Site Tags - Optimize client roaming - Validate mobility tunneling - Design mobility groups |
| Wired and Wireless Infrastructure | 30% | - Design radio management - Physical infrastructure requirements - Design for data, voice, video, location - Design wireless bridging (mesh) - Design high-density wireless networks - Logical infrastructure requirements |
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NEW QUESTION # 73
A customer has two Cisco WLCs configured in a SSO cluster. The wireless network supports a large warehouse. The customer purchases new iPads to replace legacy scanners. Both devices connect to a single SSID named Scanning by using WPA2 Personal. The customer wants to use a standards-based method for fast roaming on the new iPads. Which approach meets the scanner requirement and still supports the legacy scanners?
Answer: D
Explanation:
The design challenge is enabling IEEE 802.11r Fast BSS Transition for the new iPads (the standards-based fast roaming method) while maintaining backward compatibility for legacy RF scanners that may not support
802.11r. The SSID uses WPA2 Personal (PSK), not 802.1X enterprise authentication - therefore the correct Fast Transition variant is FT PSK (pre-shared key), not FT 802.1X (Options A and B). The critical configuration parameter is setting Fast Transition to Adaptive mode rather than mandatory. Adaptive mode is a Cisco feature that allows the AP and SSID to support both 802.11r-capable clients (which will use FT PSK for fast roaming) and non-802.11r legacy clients (which will use the standard pre-FT roaming process). In Adaptive mode, legacy scanners that cannot negotiate 802.11r during association will fall back transparently to standard roaming, while the new iPads leverage FT PSK for minimal-interruption handoffs. If Fast Transition is set to mandatory, legacy clients that do not support 802.11r will fail to associate entirely. Option C uses optimized roaming globally, which is a different mechanism and does not address the iPads ' specific need for a standards-based fast roaming solution. Reference: WLSD Study Guide - 802.11r Fast BSS Transition, FT PSK Configuration, Adaptive Fast Transition for Mixed Client Environments.
NEW QUESTION # 74
A customer has a centralized wireless deployment with N+1 high availability and few open authentication SSIDs configured. After failover, all APs are broadcasting all SSIDs, but the clients are assigned IP addresses from a different subnet. The WLANs on both WLCs are configured with the same dynamic interfaces. Which feature must be incorporated in the wireless design of the second controller?
Answer: A
Explanation:
VLAN Select is a feature that allows for the dynamic assignment of clients to different VLANs from a pool based on various criteria, such as load balancing or location. In a centralized wireless deployment with N+1 high availability, if clients are receiving IP addresses from a different subnet after failover despite the WLANs being configured with the same dynamic interfaces, the issue is that the second controller's WLAN interface mapping resolves to a different VLAN or DHCP scope. VLAN Select ensures that client VLAN assignment is consistent regardless of which controller the client connects to, preventing the subnet change behavior observed during failover.
Without VLAN Select, even identically named dynamic interfaces on two WLCs may map to different VLANs if the underlying switch configuration differs.
NEW QUESTION # 75
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: A
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 # 76
A campus has eight controllers in a single RF group. The engineer wants deterministic control over which controller performs the RRM calculations. Which design approach should be used?
Answer: B
Explanation:
By default, controllers in an RF group elect a leader dynamically, and that election can shift to a different controller after a reboot, upgrade, or network event - which means the engineer cannot predict which platform is running the RRM algorithms or where to look for RF group history and diagnostics. Configuring a static RF group leader pins that role to a chosen controller, giving deterministic behavior for troubleshooting, capacity planning, and change control, and ensuring the leader is a platform sized appropriately for the calculation load. Sharing a mobility group name governs client roaming context exchange and does not control RF group leadership.
Disabling RRM on the other controllers would leave their APs without dynamic channel and power management rather than delegating the calculation. The default election does consider platform capability and other factors rather than simply selecting the lowest IP address, and relying on it is precisely the non-deterministic behavior the static configuration exists to eliminate.
NEW QUESTION # 77
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 and must remain in Client Serving mode to maintain uninterrupted service. The XOR radio (slot 0) is currently either operating as a secondary 5 GHz radio or idle. By setting the XOR radio to Monitor mode, it becomes a dedicated scanner that continuously scans all channels across both 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. This covers the previously unmonitored 2.4 GHz band and provides supplementary 5 GHz monitoring. No additional APs need to be purchased because the existing AP's XOR radio is repurposed.
NEW QUESTION # 78
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