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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design radio management - Design high-density wireless networks - Design for data, voice, video, location - Logical infrastructure requirements - Design wireless bridging (mesh) |
| Wireless Site Survey | 25% | - Post-deployment site survey - Predictive site survey - Layer 1 site survey analysis - Material attenuation and its design effects - Pre-deployment site survey - Planning tools and network metrics evaluation - Collect design requirements and evaluate constraints |
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Mobility | 25% | - Optimize client roaming - Design mobility groups - Site Tags - Validate mobility tunneling |
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質問 # 85
What happens to an AP when a flex profile name is changed in a site tag?
正解：D
解説：
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element -- when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re-evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process.
質問 # 86
An engineer must identify the network requirements for a company that has a main office and 10 branch offices. The network must be able to support data, voice, video, and location tracking. Which two factors must be considered? (Choose two.)
正解：D、E
解説：
When designing a wireless network to support diverse services - including data, voice, video, and location tracking - across a distributed enterprise with a main office and 10 branch locations, the two primary design factors directly shaping the RF and capacity architecture are the number of wireless devices requiring access and the type of site where the survey will be performed. The device count (Option B) drives AP density, channel reuse planning, capacity modeling, and controller licensing requirements. Each service type - particularly VoWLAN and video - imposes strict per-client throughput and latency constraints that must be multiplied across the concurrent device population. The type of site (Option C) determines the survey approach, attenuation characteristics, coverage requirements, and antenna selection. A warehouse, hospital, or open-plan office each demands a fundamentally different RF design. Options A and D are organizational considerations, not technical RF design inputs. Option E (power sockets) is an installation logistics concern, not a wireless design factor. Reference: WLSD Study Guide - Requirements Gathering, Site Survey Planning, Capacity and Coverage Design Methodology.
質問 # 87
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment. Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
正解：D、E
解説：
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D). UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic - both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function. HTTPS port 443 (Option B) is used for web management and API communication, not for mobility tunneling. A static RF group leader (Option C) is a RRM configuration unrelated to AP failover capability. Creating a mobility group with the same names (Option E) is a component of the configuration but alone is insufficient without the mobility tunnel and open firewall ports. Reference:
WLSD Study Guide - Inter-Site WLC Failover Design, Mobility Tunnel Requirements, Firewall Port Planning for WAN-Separated Controllers.
質問 # 88
A consulting engineer is preparing to survey a brownfield deployment for a 6000-sqft building with four floors that have APs. The entire building is being remodeled and the furniture, office walls, and decoration are being updated. The engineer must perform a survey analysis on the potential RF impact of newer furniture materials. How must the survey be conducted?
正解：C
解説：
A brownfield deployment scenario involves an existing operational wireless network where a physical remodel will change the RF environment. The engineer's task is to assess the impact of new furniture and wall materials on the existing AP placement -- a scenario requiring a predictive re- analysis of how changed materials will alter propagation from the existing AP locations. Using a survey tool such as Ekahau with the known AP positions superimposed on updated floor plans, the engineer can reconfigure material attenuation properties to reflect new construction materials and re-run the predictive propagation model. This produces a before/after comparison identifying coverage gaps or interference hotspots introduced by the remodel without requiring physical downtime or temporary infrastructure changes.
質問 # 89
A wireless engineer is designing a wireless network for a warehouse using access points with internal antennas. Which two elements have a negative effect on the wireless users? (Choose two.)
正解：B、E
解説：
In a warehouse setting, two elements with a significant negative effect on wireless performance are AP height and absorption. AP height (Option B) is critical because warehouses often have very high ceilings (25-45 feet). When APs with internal (omnidirectional) antennas are mounted too high, the signal propagates primarily in the horizontal plane and the path loss to floor-level worker devices becomes excessive.
Additionally, metal shelving between the AP and users further attenuates the already weak signal at high mounting heights. Absorption (Option E) is a major challenge in warehouses because the inventory stored on metal racks, particularly liquid goods, dry goods in cardboard, and dense materials, absorbs RF energy significantly. Metal racking causes both absorption and reflection, creating RF shadows and multipath environments that degrade connection quality. Wireless channels (Option A) are a design parameter, not an environmental impediment. Client authentication (Option C) and authorization (Option D) are network security processes unrelated to RF propagation quality. Reference: WLSD Study Guide - Warehouse Wireless Design, AP Height Considerations, RF Absorption in Industrial Environments.
質問 # 90
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