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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wireless Site Survey | 25% | - Planning tools and network metrics evaluation - Layer 1 site survey analysis - Collect design requirements and evaluate constraints - Material attenuation and its design effects - Pre-deployment site survey - Predictive site survey - Post-deployment site survey |
| Topic 2: Wired and Wireless Infrastructure | 30% | - Design for data, voice, video, location - Design radio management - Design wireless bridging (mesh) - Physical infrastructure requirements - Design high-density wireless networks - Logical infrastructure requirements |
| Topic 3: Mobility | 25% | - Validate mobility tunneling - Optimize client roaming - Site Tags - Design mobility groups |
| Topic 4: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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NEW QUESTION # 100
A customer is planning to replace older access points with Cisco 4800 Series Access Points. Unaware of the infrastructure requirements, the client has an engineer investigate the inline power requirement. Which IEEE
802.3 standard complies with the Cisco 4800 Series Access Points?
Answer: B
Explanation:
The Cisco Aironet 4800 Series Access Point is a tri-radio, high-performance access point designed for high- density environments. It draws significantly more power than older dual-radio APs and requires IEEE 802.3bt (also known as PoE++), which provides up to 90W per port at the Power Sourcing Equipment. IEEE 802.3af (Type 1 PoE) delivers only 15.4W and 802.3at (Type 2 PoE+) provides up to 30W - both are insufficient for full functionality of the 4800 series, which has a dedicated third scanning radio that requires the additional power budget provided by 802.3bt. IEEE 802.3ac is a standard related to VLAN tagging and is entirely unrelated to Power over Ethernet. Engineers designing wired infrastructure for Cisco 4800 deployments must ensure switches support 802.3bt Type 3 or Type 4 to guarantee full AP functionality across all three radios simultaneously. Reference: WLSD Study Guide - Wired Infrastructure Design, PoE Standards and Power Budget Planning, Cisco 4800 Series AP Specifications.
NEW QUESTION # 101
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 # 102
An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?
Answer: C
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non- routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with. If different virtual IP addresses were used (Option B), clients roaming between controllers would experience DHCP failures during inter-controller roaming because the DHCP server address seen by the client would change. Options A and C relate to DNS hostname configuration, which is useful for AP discovery but does not affect the roaming behavior of client devices. The virtual IP address consistency across all mobility group members is a fundamental requirement for seamless inter-controller roaming. Reference: WLSD Study Guide - Mobility Group Configuration, Virtual IP Address, Inter- Controller Roaming Requirements.
NEW QUESTION # 103
A university lecture hall has a Cisco wireless high-density network with this configuration: ?5 GHz only ?20-MHz channels ?UNII-1, UNII-2, and UNII-2E channels ?TPC minimum = 8 ?TPC maximum = 14 The lecture hall is 200 feet by 100 feet and has 16 Cisco APs that use directional antennas. Which feature must be included in the design to mitigate and reduce high-channel utilization from rogue APs?
Answer: D
Explanation:
Receive Start of Packet (RxSOP) is a Cisco proprietary mechanism that defines the minimum received signal threshold at which an access point will acknowledge an 802.11 frame and begin processing it. In a high-density lecture hall environment with 16 APs and directional antennas on a constrained channel plan, rogue APs operating on the same or adjacent channels contribute directly to elevated channel utilization by causing unnecessary medium contention, virtual carrier sensing via NAV, and clear channel assessment deferral. By raising the RxSOP threshold on the legitimate APs, the engineer creates a higher signal floor requirement -- only signals above the configured RxSOP level are processed. Signals from distant rogue APs, arriving below this threshold, are silently discarded rather than processed, preventing them from consuming airtime through CCA deferral and NAV mechanisms.
NEW QUESTION # 104
Which strategies must the engineer use for the antenna deployment model in a warehouse?
Answer: C
Explanation:
Warehouse wireless deployments present unique RF engineering challenges: extremely high ceilings (often
25-45 feet), dense metallic shelving systems that create specular reflections and RF shadows, narrow aisles between rack systems, and the need to cover linear travel paths for RF scanner devices. The recommended Cisco antenna strategy for warehouses is wall-mounted patch (directional) antennas. Patch antennas provide a forward-facing radiation pattern that can be aimed precisely down warehouse aisles, delivering concentrated RF energy where RF scanners actually operate - in the aisles between shelving - rather than dispersing energy into metallic shelving structures. Wall mounting at intermediate height (typically 10-15 feet on aisle- end walls) places the antenna at a height that aligns the main lobe with the working zone of handheld scanners. Ceiling-mounted omnidirectional antennas (Options A and C) at warehouse ceiling height suffer from excessive path loss to floor-level devices and metal shelving obstructions. Low-gain wall-mounted omnidirectional antennas (Option B) lack the directivity needed to focus energy down specific aisles.
Reference: WLSD Study Guide - Warehouse Wireless Design, Antenna Selection and Placement, Industrial RF Environment Considerations.
NEW QUESTION # 105
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