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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wireless Infrastructure Design | 30% | - Wireless Controller architecture and deployment
|
| Topic 2: WLAN High Availability and Security Design | 20% | - High availability design
|
| Topic 3: Wireless Site Survey | 25% | - Layer 1 site survey execution and analysis - RF propagation and attenuation analysis - Design requirements collection and constraint evaluation
|
| Topic 4: Mobility Design | 25% | - Guest mobility and BYOD design - Roaming optimization
|
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NEW QUESTION # 80
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).
NEW QUESTION # 81
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
Answer: A
Explanation:
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group ' s communication plane. Service port IP addresses (Option A) are unique per controller. Interface IDs (Option B) are locally significant identifiers. Management IP addresses (Option C) are unique per WLC and identify each peer in unicast configurations. Reference: WLSD Study Guide - Mobility Group Configuration, Multicast Mobility Messaging, WLC Peer Communication.
NEW QUESTION # 82
A customer wants to provide wireless coverage in a parking lot outside of a building. An engineer determines that three APs are required. The APs can be mounted on the light poles in the parking lot because there are cable routes already in place for these locations. The closest wiring closet is approximately 200 meters away.
Which setup powers and connects the APs back to the customer network?
Answer: D
Explanation:
This question hinges on a fundamental network engineering constraint: the maximum transmission distance of copper Ethernet cabling. IEEE 802.3 standards specify a maximum segment length of 100 meters (328 feet) for all standard PoE and Ethernet over Category 5e, 6, or 6A UTP copper cabling. The parking lot light poles are approximately 200 meters from the closest wiring closet - more than double the maximum copper distance. This immediately eliminates Options A and D, which specify Category 6 UTP cabling: at 200 meters, UTP copper cannot reliably carry Ethernet at any supported speed, and PoE cannot be delivered over this distance regardless of standard. The correct solution is fiber optic connectivity between the wiring closet and the parking lot, combined with a local AC/DC power module at each pole location. Fiber optic cabling supports single-mode runs of kilometers and multi-mode runs of hundreds of meters at Gigabit speeds - easily spanning 200 meters. At the AP mounting location on the light pole, an AC/DC power module (powered from the pole ' s existing electrical supply) converts AC power to the DC power the AP requires.
Option B (fiber with 802.3af) is incorrect because PoE cannot be delivered over fiber - 802.3af requires copper cabling for simultaneous power and data delivery. Reference: WLSD Study Guide - Outdoor AP Deployment, Fiber vs. Copper Distance Limitations, Outdoor Power Solutions.
NEW QUESTION # 83
A customer has an existing wireless network with a Cisco 9800 WLC high availability cluster and Cisco 9120 APs. The customer asks an engineer to perform a post wireless survey that includes a list of any non-802.11 devices on the 5 GHz band. The engineer performs the survey using an
802.11a/b/g/n/ac/ax WLAN adapter but did not use a spectrum analyzer. Which approach meets the requirements?
Answer: C
Explanation:
Non-802.11 device detection on the 5 GHz band without a dedicated spectrum analyzer is possible through Cisco's CleanAir technology, which is embedded as an RF ASIC in many Cisco AP models including the 9120 series. CleanAir operates at the hardware layer -- below the
802.11 MAC -- enabling the APs to detect, classify, and report non-802.11 interference sources such as cordless phones, microwave ovens, video cameras, radar, and other unlicensed RF emitters in the 5 GHz spectrum. The WLC aggregates CleanAir reports from all APs and provides a consolidated interference device list accessible through the WLC's monitoring interface. Since the question specifies the 5 GHz band, the relevant 802.11 protocol for 5 GHz is 802.11a (and its successors 802.11n and 802.11ac). Exporting the list of 802.11a interferers from the WLC using the CleanAir RF ASIC correctly targets the 5 GHz band and identifies non-802.11 devices detected there.
NEW QUESTION # 84
Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?
Answer: A
Explanation:
In a high-availability configuration with multiple WLCs in a mobility group, when APs that only have a primary controller configured become orphaned (their primary WLC fails), they will by default join the controller with the lowest percentage of associated APs per license capacity. This load-based selection mechanism ensures a balanced distribution of APs across the remaining controllers in the mobility group. The WLC with the lowest percentage of AP capacity utilized is chosen because it has the most headroom to accept additional APs without becoming overloaded. This prevents a single backup controller from becoming overwhelmed while others remain underutilized.
NEW QUESTION # 85
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