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| Section | Objectives |
|---|---|
| Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Physical environment assessment and constraints - Coverage and capacity planning |
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| 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 | - Channel planning and interference mitigation - Antenna types and placement strategies - RF behavior and propagation |
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NEW QUESTION # 18
An engineer configured the optimized client roaming on Cisco WLC with an RSSI threshold of -72 dBm.
Clients report frequent disconnections. What must be configured for the AP to guide the client to a better AP?
Answer: A
Explanation:
The scenario presents a critical distinction in where Cisco WLC features are configured. Optimized roaming on Cisco WLC is a radio-level feature that monitors connected client RSSI and, when a client ' s signal falls below the configured threshold (-72 dBm), triggers a disassociation to force the client to reconnect to a stronger AP. However, without a mechanism to guide the client proactively before reaching the threshold, clients that disassociate simply reconnect to whatever AP their device selects, potentially causing the reported frequent disconnections. BSS Transition Management (802.11v) is configured at the SSID level and provides the complementary mechanism: before the client reaches the RSSI threshold, the AP sends a BSS Transition Management Request pointing the client toward a specific target AP with stronger signal. The correct architecture requires: optimized roaming configured at the radio level (triggering disconnection when RSSI falls too low) combined with BSS transition enabled at the SSID level (guiding the client to a better AP before forced disconnection). Options C and D incorrectly reverse the configuration levels for these features.
Disabling coverage hole detection (Option B) addresses a different problem and would not resolve the disconnection issue. Reference: WLSD Study Guide - Optimized Roaming Configuration, BSS Transition Management (802.11v), Client Roaming Architecture on Cisco WLC.
NEW QUESTION # 19
An engineer is designing a wireless network for a facility located 3 km from an airport with a terminal Doppler weather radar installation. Which design consideration applies to the 5 GHz channel plan?
Answer: C
Explanation:
Dynamic Frequency Selection is a regulatory requirement that obligates a Wi-Fi device operating on affected 5 GHz channels to detect radar signals and vacate the channel within a defined interval, then remain off that channel for a non-occupancy period of 30 minutes. When this occurs, the AP moves to a new channel and associated clients must re-associate, producing a brief but real service interruption. Near an airport with terminal Doppler weather radar, the probability of these events is materially higher, so the engineer must weigh the additional channel capacity DFS provides against the risk of periodic disruption - often excluding the channels closest to the radar's operating frequency for latency-sensitive SSIDs while retaining the rest.
DFS channels cannot be locked against radar-triggered changes, since compliance is mandatory.
DFS does not confer higher transmit power, and radar detection applies to UNII-2 and UNII-2 Extended, not UNII-1.
NEW QUESTION # 20
An engineer is finalizing the design for a WLAN dedicated to wireless VoIP handsets. Which setting should be applied to this WLAN, and why?
Answer: B
Explanation:
Band Select works by suppressing 2.4 GHz probe responses to dual-band capable clients, deliberately withholding replies so the client is nudged toward discovering the 5 GHz radio instead. That suppression introduces delay into the probe and discovery process, which is harmless for a laptop associating once at the start of the day but damaging for a handset attempting to find a roam target while a call is in progress. Cisco's guidance is therefore to disable Band Select on voice WLANs and instead steer handsets to 5 GHz through client configuration or by not enabling the SSID on 2.4 GHz at all. Client Load Balancing should also be disabled on voice WLANs for the same class of reason - it rejects association attempts to encourage the client toward a different AP, which can block a roaming handset from joining the AP it actually needs. Passive Client mode addresses devices that do not send traffic until polled, such as certain industrial controllers, and is unrelated to handset roaming.
NEW QUESTION # 21
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: C
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.
NEW QUESTION # 22
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. Options A and D are not valid Cisco WLC commands. Option C enables configuration-level mobility debugging but does not specifically validate handoff packet flow.
Reference: WLSD Study Guide - Mobility Troubleshooting, Debug Commands, Inter-Controller Roaming Validation.
NEW QUESTION # 23
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