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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 2: RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| Topic 3: Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| Topic 4: Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
| Topic 5: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 6: Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
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NEW QUESTION # 51
An engineer is designing an outdoor mesh network for a container yard. Which two design rules apply to the mesh deployment? (Choose two.)
Answer: A,C
Explanation:
In a Cisco mesh deployment, the Root AP (RAP) has a wired connection to the network and the Mesh APs (MAPs) connect back to it over a wireless backhaul, typically using the 5 GHz radio.
Cisco recommends limiting the mesh to no more than four hops from RAP to the furthest MAP (Option A); while more hops are technically possible, each additional hop increases latency, jitter, and convergence time after a link failure. Backhaul throughput is roughly halved with each hop (Option C) because a MAP that relays traffic must both receive and retransmit each frame on the same half-duplex radio channel, consuming airtime twice. This compounds down the chain, so an eight-hop design delivers negligible usable throughput at the far end. MAPs by definition have no wired uplink, and RAPs and their associated MAPs must share the same bridge group name to form the mesh tree.
NEW QUESTION # 52
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
Answer: A
Explanation:
In Cisco's AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort -- it should only receive AP associations when all other options are exhausted.
Configuring the service/dev controller as the tertiary controller in the APs' preference configuration ensures exactly this behavior:
APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages.
NEW QUESTION # 53
A wireless engineer is getting ready to perform a predictive site survey. The new network needs to support data and voice over wireless. Which two Cisco recommendations should be considered for the design?
(Choose two.)
Answer: B,C
Explanation:
For a network supporting both data and voice over wireless, two key Cisco design recommendations apply.
First, the 5 GHz radio band is recommended for voice over wireless due to its wider channel bandwidths, allowing for higher data rates and better quality of service for latency-sensitive applications. 40 MHz channels in the 5 GHz band provide significantly higher throughput than 20 MHz channels in 2.4 GHz, making Option B correct for the bandwidth reason stated. Second, setting the cell boundary to -67 dBm ensures sufficient signal strength for reliable voice communication at the cell edge, which is the Cisco standard threshold for VoWLAN coverage. Options C and E are partially correct (24 non-overlapping channels is accurate, 15-20% overlap is standard) but B and D are the primary Cisco recommendations that define the design targets for a predictive survey supporting voice. Reference: WLSD Study Guide - VoWLAN Design Requirements, Predictive Survey Design Criteria, 5 GHz Band Selection.
NEW QUESTION # 54
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: C
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 # 55
What causes the most signal attenuation based on the wireless design tools?
Answer: C
Explanation:
Metal doors cause the most signal attenuation among common building materials due to the fundamental electromagnetic properties of metal. Metal is highly reflective and absorptive of radio frequency signals - it creates what is effectively a Faraday cage effect around any room or space it encloses. In wireless design attenuation modeling tools such as Ekahau, metal is assigned the highest attenuation value among standard building materials, typically 30+ dB per surface. Cinder block walls (Option A) are dense and provide significant attenuation (10-15 dB) but are not as RF-impenetrable as solid metal. Glass walls (Option C) and office windows (Option D) have relatively low attenuation values (2-4 dB) due to the minimal RF-absorbing properties of glass. When engineers model attenuation materials in predictive survey tools, metal doors and metal-containing structures consistently produce the highest per-surface attenuation values, making them the primary barrier obstacles to plan around. Reference: WLSD Study Guide - RF Signal Attenuation, Building Material Attenuation Values, Predictive Survey Material Modeling.
NEW QUESTION # 56
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