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| Section | Objectives |
|---|---|
| Topic 1: Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Physical environment assessment and constraints - Coverage and capacity planning |
| Topic 2: Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
| Topic 3: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 4: Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
| Topic 5: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 6: RF Fundamentals and Design Principles | - Channel planning and interference mitigation - RF behavior and propagation - Antenna types and placement strategies |
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NEW QUESTION # 120
A university has three campus locations and the main data center. Each campus location has a Cisco Catalyst 9800-40 WLC that manages 600 APs. The data center has a Catalyst 9800-40 WLC, which serves as N+1 backup for each campus WLC. A consulting engineer must install four additional Catalyst 9800-40 WLCs to serve as high availability SSO pairs for each campus, but only two have been approved due to budget restrictions. Requirements: Data center WLC must always be available as N+1 backup, Campus1 WLC must operate with zero downtime, and in the event of multiple campus outages, the AP priority order is to support Campus3, Campus2, then Campus1. Which design approach must the consulting engineer take?
Answer: D
Explanation:
This design scenario requires careful interpretation of the SSO pair function and AP priority semantics. The SSO requirement for Campus1 zero downtime means Campus1's WLC must be paired in an SSO relationship -- SSO provides hitless failover with no AP disassociation and no client reauthentication. The data center WLC, which must always remain available as N+1 backup for all campuses, is the logical SSO partner for Campus1 WLC. The SSO pair presents as a single logical entity, ensuring the data center WLC remains active and capable of serving as N+1 backup while simultaneously providing SSO for Campus1. The AP priority for the N+1 backup scenario defines the recovery order when the backup controller must simultaneously handle APs from multiple campuses. In Cisco WLC AP failover priority, priority 1 is Critical (highest). The stated recovery order -- Campus3 first, Campus2 second, Campus1 last -- maps to: Campus3 APs assigned priority 4 (Cisco's highest numeric value in the 4-tier system, equating to the highest service recovery priority in this context), Campus2 APs priority 2, and Campus1 APs priority 1 (lowest, recovered last). Option C correctly pairs the data center WLC with Campus1 WLC for SSO and assigns AP priorities in the correct descending recovery order.
NEW QUESTION # 121
A consultant must design a WLAN for a large campus with high AP density, 50-100 clients per cell, 5 Mbps throughput per client minimum, 5 GHz and 2.4 GHz coverage at -67 dBm, and no 802.11b clients. Which two WLAN design approaches meet the requirements? (Choose two.)
Answer: B,E
Explanation:
Designing for 50-100 clients per cell with 5 Mbps minimum throughput and no 802.11b clients requires two critical optimizations. First, setting minimum mandatory data rates to 12-18 Mbps (Option A) removes legacy lower data rates from the AP ' s supported rate set. When 1, 2, 5.5, and 11 Mbps rates are disabled and 12 Mbps becomes the minimum mandatory rate, legacy 802.11b clients are excluded from the cell, airtime efficiency improves dramatically, and clients connecting at higher rates use less channel time per frame, increasing effective capacity. Second, Flexible Radio Assignment (FRA) for 2.4 GHz reduction (Option D) is critical in high-density environments. FRA allows the WLC to dynamically reassign some 2.4 GHz radios to 5 GHz operation or monitor mode, reducing 2.4 GHz cell size and interference while increasing 5 GHz capacity in the high-density area. Option C directly contradicts the no-802.11b requirement. Option B (6 SSIDs per AP) is a management consideration but does not directly address throughput. Option E (80-160 MHz channels) would consume available spectrum, reducing the number of usable non-overlapping channels and worsening co-channel interference at high density. Reference: WLSD Study Guide - High-Density WLAN Design, Minimum Data Rate Configuration, Flexible Radio Assignment (FRA).
NEW QUESTION # 122
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs. To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
Answer: A
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment). This tunneling adds encapsulation overhead -- CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor.
Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping -- reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead.
NEW QUESTION # 123
A wireless engineer is using Ekahau Site Survey to validate that an existing wireless network is operating as expected. A Cisco CleanAir AP is used for Layer 1 survey by using Metageek Chanalyzer only on the current operating channel. Which operating mode is configured for the Cisco CleanAir AP?
Answer: A
Explanation:
When using Metageek Chanalyzer in conjunction with a Cisco CleanAir-capable AP for Layer 1 spectrum analysis, the AP must be configured in SE-Connect mode (Spectrum Expert Connect). SE-Connect mode enables the AP ' s CleanAir radio to operate as a dedicated spectrum analyzer, feeding raw spectrum data to the connected Chanalyzer software for visualization and analysis. In this mode, the AP does not serve any Wi- Fi clients and instead focuses all radio resources on spectrum scanning. Metageek Chanalyzer uses the SE- Connect mode specifically to receive the CleanAir ASIC ' s spectrum analysis data. Local mode (Option A) serves clients normally, only providing periodic CleanAir reports. Sniffer mode (Option B) captures 802.11 frames for protocol analysis and does not provide raw spectrum data to Chanalyzer. Monitor mode (Option C) performs WIDS scanning and RRM measurements but does not support the direct Chanalyzer integration. SE- Connect is the specific mode that enables external spectrum analysis software to use the CleanAir ASIC ' s spectrum data in real time. Reference: WLSD Study Guide - Cisco CleanAir Technology, AP Operating Modes, SE-Connect Mode for Spectrum Analysis.
NEW QUESTION # 124
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: A
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 # 125
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