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| Section | Weight | Objectives |
|---|---|---|
| Mobility Design | 25% | - Mobility architecture models
|
| Wireless Infrastructure Design | 30% | - Wireless Controller architecture and deployment
|
| Wireless Site Survey | 25% | - Pre-deployment survey and validation - Design requirements collection and constraint evaluation
- RF propagation and attenuation analysis |
| WLAN High Availability and Security Design | 20% | - Security architecture design
- High availability design
|
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NEW QUESTION # 88
An engineer is designing a point-to-point outdoor bridge link spanning 4 km between two buildings. Which two factors must be calculated during the design? (Choose two.)
Answer: B,E
Explanation:
An outdoor bridge link is fundamentally an RF engineering problem, and two calculations determine whether the link will work. Fresnel zone clearance (Option A) accounts for the ellipsoidal volume around the direct line of sight through which most of the RF energy travels; obstructions intruding into this zone cause diffraction loss even when visual line of sight appears clear. Cisco's design guidance is to maintain at least 60% of the first Fresnel zone free of obstruction, which at 4 km requires meaningful antenna height above terrain, buildings, and tree lines. The link budget (Option C) sums transmit power, antenna gain at both ends, cable and connector losses, and free-space path loss, then compares the result against receiver sensitivity for the desired data rate - with adequate fade margin, typically 10 to 20 dB, to survive rain and multipath. Mobility group names, DHCP scoping, and MTU are network configuration details that do not determine whether the RF link closes.
NEW QUESTION # 89
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: D
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 # 90
An engineer is using Ekahau Site Survey to create a WLAN plan for a warehouse. The plan is to use patch antennas. Which setting is adjusted when simulated APs are placed on the map?
Answer: D
Explanation:
In Ekahau Site Survey, when planning a warehouse deployment using patch (directional) antennas, the antenna downtilt setting is the critical adjustment made when placing simulated APs on the floor plan map. Patch antennas have a defined radiation pattern with a main lobe that must be aimed precisely at the intended coverage zone. In a warehouse environment, APs with patch antennas are typically wall-mounted and aimed down aisles. The downtilt angle determines the vertical component of the antenna's aim -- adjusting the downtilt in Ekahau tilts the simulated antenna's main radiation lobe downward toward the warehouse floor and the working zone of RF scanner devices, rather than projecting RF energy horizontally at an ineffective angle. Ekahau allows engineers to specify the horizontal and vertical orientation of the antenna in three dimensions, and the downtilt value directly controls how the software models the antenna's coverage pattern in the vertical plane.
NEW QUESTION # 91
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: D
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 # 92
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: D
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 # 93
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