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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN High Availability and Security Design | 20% | - High availability design
|
| Topic 2: Wireless Site Survey | 25% | - RF propagation and attenuation analysis - Layer 1 site survey execution and analysis - Pre-deployment survey and validation - Design requirements collection and constraint evaluation
|
| Topic 3: Mobility Design | 25% | - Mobility architecture models
|
| Topic 4: Wireless Infrastructure Design | 30% | - Wireless Controller architecture and deployment
|
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NEW QUESTION # 122
A university is deploying a wireless lecture-capture application that streams video to many clients simultaneously. Which controller design should the engineer specify to make efficient use of the wired network?
Answer: B
Explanation:
In multicast-unicast mode the controller replicates each multicast packet once for every joined AP and sends the copies as unicast CAPWAP frames, which consumes controller CPU and multiplies traffic across the wired uplink in direct proportion to the AP count - this does not scale for a campus-wide video application. In multicast-multicast mode the controller sends a single copy of the packet to a configured AP multicast group address, and the wired network's multicast infrastructure replicates it only where needed, delivering it to all subscribed APs efficiently. This requires that multicast routing (PIM) be enabled on the wired infrastructure between the controller and the APs, and that IGMP snooping be configured appropriately on the access switches.
Enabling broadcast forwarding floods traffic without any subscription control and creates its own scaling problem, and disabling multicast entirely returns the design to per-client unicast replication over the air.
NEW QUESTION # 123
A wireless engineer must design a WLAN for a university that requires outdoor Wi-Fi access. Which obstruction has the greatest effect on wireless signal propagation?
Answer: B
Explanation:
In outdoor wireless deployments, foliage - particularly dense trees - represents the most significant and variable RF obstruction that engineers must account for during site survey and design. Trees are problematic for multiple compounding reasons: the high water content of living tissue causes signal absorption consistent with the principle that water is an effective absorber of 2.4 GHz and 5 GHz RF energy; the irregular branching structure causes multi-path scattering; and foliage density changes seasonally, meaning signal propagation characteristics measured during winter may differ substantially from summer readings when leaves are fully developed. A fully leafed deciduous tree can attenuate a 5 GHz signal by 6-15 dB depending on density and depth. Wind (Option A) causes only momentary mechanical movement of foliage and is not an obstruction itself. Rain (Option B) causes some absorption at higher frequencies but its effect at 2.4 GHz and
5 GHz in typical conditions is marginal compared to foliage. Poles (Option D) are thin structures with minimal RF impact. Outdoor surveys for university campuses must specifically account for tree locations, canopy density, and seasonal variation. Reference: WLSD Study Guide - Outdoor Wireless Design, Environmental RF Attenuation Factors, Outdoor Site Survey Considerations.
NEW QUESTION # 124
A consulting engineer is preparing to survey a brownfield deployment for a 6000-sqft building with four floors that have APs. The entire building is being remodeled and the furniture, office walls, and decoration are being updated. The engineer must perform a survey analysis on the potential RF impact of newer furniture materials. How must the survey be conducted?
Answer: B
Explanation:
A brownfield deployment scenario involves an existing operational wireless network where a physical remodel will change the RF environment. The engineer's task is to assess the impact of new furniture and wall materials on the existing AP placement -- a scenario requiring a predictive re- analysis of how changed materials will alter propagation from the existing AP locations. Using a survey tool such as Ekahau with the known AP positions superimposed on updated floor plans, the engineer can reconfigure material attenuation properties to reflect new construction materials and re-run the predictive propagation model. This produces a before/after comparison identifying coverage gaps or interference hotspots introduced by the remodel without requiring physical downtime or temporary infrastructure changes.
NEW QUESTION # 125
A network engineer is configuring high availability on an access point. What is the maximum number of controllers that can be configured?
Answer: C
Explanation:
When configuring high availability on a Cisco access point, the AP can be configured with a maximum of three controllers: a primary controller, a secondary controller, and a tertiary controller. This three-tier hierarchy defines the failover order - the AP first attempts to join its primary controller, then the secondary if the primary is unavailable, and finally the tertiary if both the primary and secondary are unreachable. After exhausting all three configured options, the AP enters a discovery process to find any available controller.
This three-controller configuration (primary, secondary, tertiary) allows network engineers to implement N+1 redundancy where critical APs can be directed to specific backup controllers in a deliberate sequence.
Limiting the configuration to only 2 controllers (as stated in Option B which would be incorrect) would reduce redundancy options for environments with geographically distributed controllers requiring specific failover paths. Reference: WLSD Study Guide - AP High Availability Configuration, Primary/Secondary
/Tertiary Controller Assignment, AP Failover Design.
NEW QUESTION # 126
What happens to an AP when a flex profile name is changed in a site tag?
Answer: C
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 # 127
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