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| Section | Objectives |
|---|---|
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| RF Fundamentals and Design Principles | - Antenna types and placement strategies - RF behavior and propagation - Channel planning and interference mitigation |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
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NEW QUESTION # 84
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
Answer: A
Explanation:
In Cisco's AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort -- it should only receive AP associations when all other options are exhausted.
Configuring the service/dev controller as the tertiary controller in the APs' preference configuration ensures exactly this behavior:
APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages.
NEW QUESTION # 85
A customer has multiple WLCs running in N+1 redundancy with APs load balanced between the WLCs. The customer performs AP failover testing between the WLCs and notices that some of the APs do not move back to their primary WLC after it recovers. What are two points that must be addressed in the design? (Choose two.)
Answer: A,C
Explanation:
In an N+1 redundancy deployment, an AP ' s ability to return to its designated primary WLC after that controller recovers depends on two distinct configuration requirements working in concert. First, the AP Fallback feature (Option C) must be enabled on the WLC. AP Fallback instructs APs to monitor the availability of their configured primary controller and automatically reconnect to it when it becomes available again, rather than remaining permanently joined to the N+1 backup controller. Without AP Fallback enabled, APs stay connected to whichever controller they most recently joined. Second, the APs must have their primary WLC information correctly configured (Option D). If an AP does not have the primary controller ' s name, IP address, or FQDN correctly set, it cannot identify when its designated primary has recovered and therefore cannot initiate a return fallback. DHCP Option 43 (Option A) is used for initial AP discovery only.
Secondary WLC configuration (Option B) addresses failover direction but not the return path. AP failover priority (Option E) controls which APs are moved first during a failover event, not whether fallback occurs.
Reference: WLSD Study Guide - N+1 Redundancy Design, AP Fallback Configuration, Controller Primary, Secondary and Tertiary Assignment.
NEW QUESTION # 86
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
Answer: A
Explanation:
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users ?1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput -- this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is therefore: total required throughput divided by throughput per channel = 100 Mbps ?20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the 5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco's high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population.
NEW QUESTION # 87
A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the VoWLAN SSID?
Answer: B
Explanation:
IEEE 802.11v BSS Transition Management is the standard that enables the network (via the AP) to actively provide roaming recommendations and suggestions to associated clients. When enabled on a SSID, the AP can send BSS Transition Management Request frames to clients, informing them of preferred target APs ranked by signal quality, load, and channel conditions. Critically, BSS Transition Management is a voluntary mechanism - clients that support 802.11v can act on the AP ' s recommendation, while clients that do not support 802.11v simply ignore the BSS Transition Request frames and continue operating normally. This selective applicability directly satisfies the requirement that non-VoWLAN clients must not be impacted.
802.11k (Option A) enables clients to build neighbor lists through measurement reports - this is a client- initiated process, not an AP-to-client recommendation. CCKM (Option B) is a Cisco proprietary fast roaming mechanism for legacy clients, unrelated to roaming guidance. 802.11r (Option D) accelerates the re- association handshake during roaming but does not provide proactive roaming recommendations. Reference:
WLSD Study Guide - VoWLAN Design, 802.11v BSS Transition Management, Roaming Optimization Protocols.
NEW QUESTION # 88
A stadium deployment requires maximum channel reuse across 300 APs in the 5 GHz band.
Which channel design should the engineer specify?
Answer: C
Explanation:
In very high density environments, the dominant design constraint is the number of unique non- overlapping channels available for reuse, not the peak throughput of any single client. A 20 MHz channel width yields the largest number of distinct channels, which minimizes co-channel interference between the tightly spaced APs a stadium requires. Enabling DFS channels adds the UNII-2 and UNII-2 Extended bands, roughly doubling the available channel count in most regulatory domains and further improving the reuse pattern. Widening the channel to 40, 80, or
160 MHz has the opposite effect - each doubling of channel width halves the number of available channels, so an 80 MHz plan in a 300-AP venue guarantees that many APs share the same channel and contend for the same airtime. Disabling DFS or excluding UNII-2 discards channels the design cannot afford to lose.
NEW QUESTION # 89
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