Pass the CWNP CWDP Wi-Fi Design CWDP-305 Questions and answers with ExamsMirror

The introduction of a new requirement, such as supporting RFID location tracking, after the site survey has commenced constitutes scope creep.Scope creep refers to the uncontrolled expansion of project scope without corresponding adjustments to time, cost, and resources.Implementing location tracking requires specific design considerations, including AP placement and calibration, which should be planned from the project's outset.Introducing such requirements mid-project can lead to design inefficiencies and increased costs.

In North America, Wi-Fi devices operating in the 2.4 GHz band are typically restricted to channels 1 through 11. However, in Europe, channels 12 and 13 are also permitted. If a European AP is configured to operate on channel 13, a North American device may not recognize or connect to it, leading to low RSSI readings or inability to connect.

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In this scenario, the AP in the room is likely operating on channel 13, which the traveler's device cannot utilize, resulting in low RSSI. Conversely, the lobby APs are operating on channels 1 through 11, which are compatible with the traveler's device, leading to normal RSSI readings.

Other options, such as the AP using ZigBee or Bluetooth, are unlikely, as these technologies are distinct from Wi-Fi and would not present as Wi-Fi SSIDs. The switchport speed, while affecting throughput, does not directly impact RSSI.

Real-Time Location Systems (RTLS) require precise triangulation, which can only occur if a device is detected by at least three APs with strong RSSI values from various angles. The best accuracy is achieved by placing APs around the perimeter and within the area so devices are surrounded.

From CWDP-305:

“For accurate Wi-Fi location tracking, ensure that client devices can be detected by a minimum of three, preferably four, APs with good signal strength. APs should be placed around the perimeter and within the location zone for proper triangulation.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Designing for Specific Applications

The primary objective of the initial pre-deployment meeting is to communicate the design decisions to the deployment team, ensuring they understand the design documentation.This alignment is crucial for the successful implementation of the WLAN infrastructure as per the design specifications.

The CWDP-305 Official Study and Reference Guide highlights the importance of clear communication during the deployment phase.

Comprehensive and Detailed Explanation:

When conducting a predictive or passive RF site survey using survey software, accurately scaling the map is a critical initial step. Without proper scaling, distance and RF propagation calculations will be inaccurate, leading to flawed design outcomes.

“Scaling the map is a required step before placing APs, drawing walls, or runningsimul-ations in predictive tools. All distance-based calculations rely on this reference.”

— CWDP-305 Study Guide, Chapter: Advanced Site Surveys

Band steering is a technique used to encourage dual-band clients to connect to the less congested 5 GHz band. However, some client devices are persistent and may not respond to steering attempts, continuing to probe only on the 2.4 GHz band. To ensure these clients can still connect to the network, band steering algorithms are designed to eventually allow association on the 2.4 GHz band after a certain number of ignored Probe Requests. This approach balances optimal network performance with client compatibility.

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Comprehensive and Detailed Explanation:

The SKINNY protocol, also known as the Skinny Client Control Protocol (SCCP), is a proprietary protocol used by Cisco for VoIP signaling between endpoints and call managers. Its presence in a protocol capture indicates that VoIP services are active on the network.

In wireless communications, lower data rates like 1 Mbps in 802.11b use simpler modulation schemes, allowing them to tolerate higher power levels before distortion occurs. Conversely, higher data rates like 54 Mbps in 802.11g use more complex modulation, which is more susceptible to distortion at high power levels.

When both signals are passed through a saturated amplifier, the 1 Mbps 802.11b signal can handle approximately 5 dB more power than the 54 Mbps 802.11g signal without significant distortion. This difference is crucial in designing systems to ensure signal integrity across varying data rates.

Comprehensive and Detailed Explanation:

Mounting APs above the ceiling can significantly degrade WLAN performance due to signal attenuation and unpredictable RF propagation.If aesthetic constraints were not communicated during the requirements gathering phase, the design likely does not account for the additional attenuation caused by ceiling materials.Therefore, it's essential to inform the stakeholder that the current deployment does not meet performance requirements and that a redesign is necessary to address the unforeseen constraints.Pass4Success