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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Topic 2: Mobility | 25% | - Design mobility groups - Validate mobility tunneling - Optimize client roaming - Site Tags |
| Topic 3: Wireless Site Survey | 25% | - Collect design requirements and evaluate constraints - Pre-deployment site survey - Layer 1 site survey analysis - Planning tools and network metrics evaluation - Post-deployment site survey - Material attenuation and its design effects - Predictive site survey |
| Topic 4: Wired and Wireless Infrastructure | 30% | - Design for data, voice, video, location - Design high-density wireless networks - Physical infrastructure requirements - Logical infrastructure requirements - Design radio management - Design wireless bridging (mesh) |
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NEW QUESTION # 78
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: C
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?5 dB depending on density and depth.
NEW QUESTION # 79
An engineer is estimating the loss between two floors of an office building. Using Ekahau, they have measured -45 dBm at the ground level of the floor with the access point and -50 dBm at the ceiling level of the floor below it. Which value is the loss of the floor?
Answer: C
Explanation:
Floor loss calculation is a fundamental skill in multi-floor wireless site survey methodology. The floor attenuation value represents the signal power reduction caused by penetrating through a single floor structure including the floor decking, subfloor, ceiling material, plenum space, and any structural elements. In this measurement scenario, the engineer has two data points: -45 dBm measured at the ground level of the floor containing the access point (the signal level just below the AP's floor) and - 50 dBm measured at the ceiling level of the floor below (the signal level just after passing through the floor structure). The floor loss is simply the difference between these two measurements: (-45 dBm) - (-50 dBm) = -45 + 50 = 5 dB. The result is expressed as a positive value (5 dB) representing attenuation -- signal power decreases by 5 dB when passing through the floor.
NEW QUESTION # 80
What happens to an AP when a flex profile name is changed in a site tag?
Answer: A
Explanation:
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.
NEW QUESTION # 81
A university wants to deploy a high density of APs in an area where a high number of users congregate. Which functionality allows the university to optimize the RF settings for APs that operate in different environments or coverage zones?
Answer: D
Explanation:
RF Profiles are a Cisco WLC configuration construct that allows administrators to define a customized set of Radio Resource Management (RRM) parameters and apply them to a subset of APs operating in a specific environment or coverage zone. Within a university high-density deployment -- where a lecture hall, outdoor quad, cafeteria, and library may each require fundamentally different RF settings -- RF Profiles enable differentiation without globally modifying all RRM parameters. An RF Profile can define custom values for: minimum mandatory data rates, maximum transmit power, minimum transmit power, channel width (20/40/80 MHz), RxSOP thresholds, client load balancing parameters, and coverage hole detection sensitivity. This allows the engineer to apply aggressive interference mitigation settings to high-density assembly areas while maintaining full-coverage settings for perimeter zones.
NEW QUESTION # 82
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: A,B
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.
NEW QUESTION # 83
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