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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Topic 2: Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design radio management - Physical infrastructure requirements - Design for data, voice, video, location - Design wireless bridging (mesh) - Logical infrastructure requirements |
| Topic 3: Mobility | 25% | - Optimize client roaming - Site Tags - Validate mobility tunneling - Design mobility groups |
| Topic 4: Wireless Site Survey | 25% | - Planning tools and network metrics evaluation - Post-deployment site survey - Collect design requirements and evaluate constraints - Pre-deployment site survey - Material attenuation and its design effects - Predictive site survey - Layer 1 site survey analysis |
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100. Frage
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
Antwort: B
101. Frage
A customer is building a new warehouse facility that has only its foundation and perimeter walls built. The building will be complete in the next eight months. The customer needs a detailed bill of materials and costs for a wireless network that must support RF scanners throughout the warehouse. How should the survey be performed?
Antwort: D
Begründung:
A predictive survey (also called a virtual or model-based survey) is the appropriate and only feasible methodology for a facility that does not yet physically exist in its complete form. Since the warehouse has only its foundation and perimeter walls, it is impossible to conduct any form of physical (active or passive) survey of the complete environment. A predictive survey uses architectural floor plans imported into a tool such as Ekahau Site Survey, where the engineer defines attenuation areas representing planned materials and structures: concrete block walls, steel shelving racks, metallic surfaces, and other warehouse-specific obstructions. The software models RF propagation through these defined attenuation values, enabling accurate AP placement planning, antenna selection, and channel planning without physical access to the complete facility. The output is a validated bill of materials with AP counts, models, and associated infrastructure requirements. Passive surveys (Options A and C) require physical APs transmitting RF signals to collect measurement data - impossible in an incomplete building. A hybrid approach mixing passive survey with predictive modeling introduces measurement errors from the incomplete physical state. Reference: WLSD Study Guide - Survey Types, Predictive Survey Methodology, Pre-Deployment Planning for New Construction.
102. Frage
A campus has two controllers, each with client VLANs on different subnets. A client associated to an AP on WLC-1 roams to an AP on WLC-2. Which behavior does the mobility design produce, and what is required?
Antwort: C
Begründung:
When a client roams between controllers whose client VLANs are on different subnets, the controllers perform a Layer 3 roam. The original controller retains the role of anchor for that client's session, the new controller becomes the foreign controller, and a mobility tunnel between them carries the client's traffic so the client can retain its existing IP address and keep its sessions alive. Cisco controllers use asymmetric tunneling for this: traffic from the client is forwarded by the foreign controller, while traffic destined for the client is tunneled from the anchor to the foreign controller, which preserves reachability without requiring the client to renumber. A Layer 2 roam occurs only when both controllers place the client on the same subnet, and it still requires the controllers to be mobility peers so client context can be exchanged. Forcing a new IP address or a full reauthentication would break the client's applications, which is precisely what the mobility architecture is designed to prevent.
103. Frage
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
Antwort: B
Begründung:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick-walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP ' s signal but cannot hear each other - making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment. Reference:
WLSD Study Guide - RF Design Fundamentals, Hidden Node Problem, Transmit Power and Cell Size Optimization.
104. Frage
An engineer must design and configure a wireless network for pervasive coverage in an oil terminal, casual web and email traffic, 5 GHz. What is the best design?
Antwort: D
Begründung:
An oil terminal presents specific wireless design constraints: the requirement is pervasive coverage (maximum geographic coverage) for low-bandwidth applications (casual web and email). These requirements prioritize coverage reach over throughput optimization. The correct approach is to keep all data rates enabled, including lower rates such as 6, 9, 12, and 18 Mbps -- because in an industrial environment with challenging RF propagation paths, reflective surfaces, and potential obstructions, lower data rates extend the functional coverage range of each AP.
Web and email traffic does not require high data rates; even 1-6 Mbps is sufficient for these applications. Disabling rates below 54 Mbps (Option A) would dramatically shrink each AP's effective coverage area, requiring many more APs for pervasive coverage and failing the primary design objective. Assigning static maximum power without RRM auto-adjustment creates excessive co-channel interference.
105. Frage
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