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

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.

Even when skipping a full pre-design site survey, performing a spectrum analysis walkthrough is considered a best practice. This is because spectrum analysis provides insights into non-Wi-Fi interference sources, such as microwave ovens, Bluetooth devices, cordless phones, and other RF-emitting equipment that may affect WLAN performance.

From CWDP-305:

“A spectrum analysis walkthrough of the facility, even in the absence of a full site survey, can reveal sources of interference that would otherwise go undetected. This step is highly recommended to validate the RF environment.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis

When establishing a long-distance wireless bridge, such as one spanning 13 kilometers, it's crucial to consider the Fresnel Zone, which is the elliptical area around the line-of-sight path between two antennas. Obstructions within this zone can cause signal degradation due to diffraction.

One significant factor affecting the Fresnel Zone over long distances is the Earth's curvature, commonly referred to as the Earth bulge. As the distance between the two points increases, the Earth's surface curves away, potentially intruding into the Fresnel Zone and obstructing the signal path. Therefore, engineers must calculate the Earth's bulge and ensure that antenna heights are sufficient to maintain a clear Fresnel Zone.

While Free Space Path Loss (FSPL), antenna gain, and receiver sensitivity are essential parameters in link budget calculations, they do not directly address the physical clearance required in the Fresnel Zone.

When working at heights, especially during the installation of Access Points (APs) on high ceilings, safety is paramount.Personal Protective Equipment (PPE) such as hardhats protect against head injuries, high visibility vests ensure that workers are easily seen, and body belts (or harnesses) provide fall protection.These are standard safety measures in such environments.NWExam

The CWDP-305 Official Study and Reference Guide underscores the importance of appropriate PPE:

"Ensure that installation personnel use appropriate PPE, including hardhats, high visibility vests, and body belts, when working at heights."

While 802.11ac and 802.11ax standards support theoretical data rates exceeding 1 Gbps, real-world throughput is often lower due to various factors, including management overhead, environmental conditions, and client capabilities. The actual data throughput experienced by clients is typically less than the maximum PHY rates due to protocol overhead and other inefficiencies inherent in wireless communication.

The CWDP-305 Official Study and Reference Guide notes:

"Theoretical maximum data rates are seldom achieved in practice due to factors such as protocol overhead, interference, and client limitations. Therefore, infrastructure upgrades should be based on actual performance requirements and measurements."

Therefore, advising an upgrade to MultiGig switches solely based on the theoretical maximum data rates of 802.11ac and 802.11ax may not be justified without considering actual network performance and requirements.