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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Physical infrastructure requirements - Design radio management - Design wireless bridging (mesh) |
| Topic 2: Wireless Site Survey | 25% | - Material attenuation and its design effects - Planning tools and network metrics evaluation - Predictive site survey - Post-deployment site survey - Layer 1 site survey analysis - Pre-deployment site survey - Collect design requirements and evaluate constraints |
| Topic 3: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Topic 4: Mobility | 25% | - Design mobility groups - Optimize client roaming - Validate mobility tunneling - Site Tags |
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NEW QUESTION # 85
An engineer must perform a predictive design for a wireless network.
The customer has devices that can tolerate at most 100 ms of delay when roaming. Which design criteria must be used?
Answer: A
Explanation:
Devices that can tolerate at most 100 ms of delay when roaming are voice devices. The 100 ms maximum roaming delay threshold is the Cisco-specified design criterion for VoWLAN implementations -- it defines the maximum time a handset can tolerate being disconnected from the wireless network during a roam event before the voice call is degraded or dropped. This threshold drives specific design requirements: 15-20% cell overlap at -67 dBm, fast roaming mechanisms (802.11r, CCKM, or OKC), and AP placement along user movement paths.
NEW QUESTION # 86
What happens to an AP when a flex profile name is changed in a site tag?
Answer: A
Explanation:
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element - when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re- evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process. Firmware updates (Option A) occur via a separate image download process. Temporary SSID disable (Option B) is not a defined behavior for profile name changes. Switching to a backup controller (Option C) requires AP failover conditions, not configuration changes. Understanding the disruptive nature of site tag modifications is essential for change management in production 9800 deployments. Reference: WLSD Study Guide - Catalyst 9800 Tag-Based Configuration Model, Site Tag Architecture, Flex Profile and AP Join Profile Management.
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: D
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
An engineer is performing capacity planning for an open-plan office with 900 concurrent devices, each requiring 2 Mbps of application throughput. Assuming approximately 120 Mbps of usable aggregate throughput per 5 GHz radio, how should the AP count be determined?
Answer: A
Explanation:
Capacity-driven design starts with aggregate demand rather than area. Here 900 devices at 2 Mbps each represent 1800 Mbps of required throughput; dividing by roughly 120 Mbps of usable per-radio throughput yields a minimum of about 15 client-serving radios, before applying any headroom for growth or peak concurrency. That number is then cross-checked against the coverage model, because the resulting AP density must still deliver the required RSSI and SNR everywhere without creating excessive co-channel interference - if capacity demands more APs than coverage requires, transmit power and channel width are reduced to keep the cells small enough to coexist. Designing purely from coverage radius (Option A) is the classic failure mode in dense environments, producing enough signal but nowhere near enough airtime. Fixed device- per-AP ratios ignore the actual application profile, and available switch ports are a constraint to satisfy, not a method for sizing the RF design.
NEW QUESTION # 89
An engineer is performing a passive survey report. The coverage heat map shows the entire site with all signal levels. To see only the desired coverage, which action must the engineer take?
Answer: A
Explanation:
To focus the coverage heat map on the desired coverage threshold, the engineer should use the RSSI slider to set the heat map to the desired cutoff filter. This action adjusts the display to show only the signal levels that meet or exceed the specified RSSI value, effectively filtering out weaker signals and highlighting areas with sufficient coverage. In Ekahau and similar survey tools, the RSSI slider provides a dynamic way to set minimum signal thresholds, allowing the engineer to quickly validate whether coverage meets design targets such as -67 dBm for voice or -70 dBm for data. Changing the color scheme (Option A) only modifies the visual representation without filtering data. The RSSI calibration tool (Option B) adjusts how the tool perceives signal levels, not the display filter. Filtering by AP (Option D) would remove APs from the view, potentially hiding coverage gaps. Reference: WLSD Study Guide - Post-Deployment Survey, Ekahau Heat Map Tools, RSSI Coverage Filtering.
NEW QUESTION # 90
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