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| Section | Objectives |
|---|---|
| Topic 1: RF Fundamentals and Design Principles | - Channel planning and interference mitigation - RF behavior and propagation - Antenna types and placement strategies |
| Topic 2: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 3: Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Topic 4: Cisco Wireless Architecture | - Mobility groups and roaming design - Controller-based architecture (WLC) - Lightweight Access Point (LAP) deployment models |
| Topic 5: Wireless Security Design | - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies |
| Topic 6: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
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98. Frage
A stadium deployment requires maximum channel reuse across 300 APs in the 5 GHz band.
Which channel design should the engineer specify?
Antwort: A
Begründung:
In very high density environments, the dominant design constraint is the number of unique non- overlapping channels available for reuse, not the peak throughput of any single client. A 20 MHz channel width yields the largest number of distinct channels, which minimizes co-channel interference between the tightly spaced APs a stadium requires. Enabling DFS channels adds the UNII-2 and UNII-2 Extended bands, roughly doubling the available channel count in most regulatory domains and further improving the reuse pattern. Widening the channel to 40, 80, or
160 MHz has the opposite effect - each doubling of channel width halves the number of available channels, so an 80 MHz plan in a 300-AP venue guarantees that many APs share the same channel and contend for the same airtime. Disabling DFS or excluding UNII-2 discards channels the design cannot afford to lose.
99. Frage
An engineer in a branch office that does not have a wired backhaul must ensure that local clients can be switched locally and authenticated centrally. In which mode must the AP be configured?
Antwort: C
Begründung:
Flex+Bridge mode is a specialized AP operating mode that combines two distinct Cisco wireless capabilities:
FlexConnect (for local switching of client data traffic and central authentication via the WLC) and Bridge
/Mesh mode (enabling wireless backhaul when no wired Ethernet uplink is available). In a branch environment without wired backhaul, a standard FlexConnect AP (Option D) cannot operate because FlexConnect still requires an Ethernet connection for its control plane. Bridge mode alone provides mesh backhaul but does not support the local switching with central authentication model required here. MAP (Option A) is a Mesh Access Point role for wireless backhaul, and RAP (Option C) is a Root Access Point with a wired connection - neither meets the no-wired-backhaul requirement with local switching.
Flex+Bridge uniquely satisfies both requirements: the Flex component allows locally switched VLANs to be bridged directly to the access layer without traversing the WAN, while the Bridge component enables the AP to use a wireless mesh link for its backhaul uplink. Central authentication is maintained via the CAPWAP control tunnel over the mesh link. Reference: WLSD Study Guide - FlexConnect Design, Mesh Networking, Flex+Bridge Mode Configuration and Use Cases.
100. Frage
An engineer is performing a Layer 1 passive wireless site survey utilizing a channel analyzer software in the 2.4 GHz spectrum. Which chart indicates the ratio of interference present during the duration of the capture?
Antwort: B
Begründung:
In a Layer 1 passive wireless site survey using a channel analyzer tool (such as Metageek Chanalyzer or Cisco Spectrum Expert) in the 2.4 GHz spectrum, the chart that indicates the ratio of interference present during the capture duration is the Duty Cycle chart. The duty cycle chart displays the percentage of time that detected energy -- including both Wi-Fi and non-Wi-Fi signals
-- is present on each channel. A high duty cycle on a channel indicates that the channel is occupied by transmissions for a significant portion of time, reducing available airtime for Wi-Fi clients. This chart directly communicates the ratio of interference because it shows what fraction of the observation period had detectable RF energy above the noise floor. Signal strength charts show amplitude (how strong), while duty cycle charts show temporal occupancy (how often) -- the latter is the correct metric for quantifying interference ratio.
101. Frage
How are mobility groups created, excluding mobility anchors?
Antwort: A
Begründung:
Mobility groups are created by configuring each Wireless LAN Controller (WLC) to use the same mobility domain name (mobility group name) and defining each WLC as a peer in the static mobility members list of every other WLC in the group. This bidirectional configuration establishes the trusted peer relationship and enables WLCs to exchange client information, security credentials, and state data for seamless roaming. The same mobility group name on all WLCs creates a shared identity; the static peer list defines which controllers are trusted mobility partners and provides their management IP addresses and MAC addresses for tunnel establishment.
102. Frage
A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the VoWLAN SSID?
Antwort: C
Begründung:
IEEE 802.11v BSS Transition Management is the standard that enables the network (via the AP) to actively provide roaming recommendations and suggestions to associated clients. When enabled on a SSID, the AP can send BSS Transition Management Request frames to clients, informing them of preferred target APs ranked by signal quality, load, and channel conditions. Critically, BSS Transition Management is a voluntary mechanism - clients that support 802.11v can act on the AP ' s recommendation, while clients that do not support 802.11v simply ignore the BSS Transition Request frames and continue operating normally. This selective applicability directly satisfies the requirement that non-VoWLAN clients must not be impacted.
802.11k (Option A) enables clients to build neighbor lists through measurement reports - this is a client- initiated process, not an AP-to-client recommendation. CCKM (Option B) is a Cisco proprietary fast roaming mechanism for legacy clients, unrelated to roaming guidance. 802.11r (Option D) accelerates the re- association handshake during roaming but does not provide proactive roaming recommendations. Reference:
WLSD Study Guide - VoWLAN Design, 802.11v BSS Transition Management, Roaming Optimization Protocols.
103. Frage
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