CWNP Updated CWDP-305 Exam Questions and Answers by ashley

In 802.1X/EAP authentication, the shared secret between the authenticator and the RADIUS server must match. If clients cannot associate and the RADIUS server is operational, the next step is to verify that the shared secret configured on both the authenticator and the RADIUS server is identical. A mismatch will prevent successful authentication.

Doubling the channel width increases the noise floor because the receiver is now listening over a wider range of frequencies, which can include more interference sources. This results in a decrease in SNR (Signal-to-Noise Ratio), which can negatively impact performance, especially in high-density deployments.

From CWDP-305:

“Channel bonding increases the bandwidth but also increases the amount of noise received. The increased noise can reduce the effective SNR and result in performance degradation, particularly in congested environments.”

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

When designing a wireless bridge over a distance of 13 kilometers, it's crucial to account for the Earth's curvature, known as the "Earth bulge," which can obstruct the Fresnel Zone and degrade the signal.The Fresnel Zone is an elliptical area around the line of sight between two antennas, and any obstruction within this zone can cause signal diffraction and attenuation.

The CWDP-305 Official Study and Reference Guide highlights this consideration:

"For long-distance point-to-point links, the Earth’s curvature becomes a factor, and the Fresnel Zone must be clear of obstructions, including the Earth bulge, to maintain signal integrity."

Therefore, when planning such links, engineers must calculate the Fresnel Zone and ensure that the Earth bulge does not intrude into this zone, possibly requiring higher antenna placements or alternative solutions.

Comprehensive and Detailed Explanation:

When designing a WLAN for a new facility, especially one that hasn't been constructed yet, apredictive site surveyis the most appropriate initial step. Predictive surveys utilize software tools to model RF behavior based on building materials, floor plans, and environmental factors. This method allows for planning of AP placements, channel assignments, and coverage areas without the need for physical access to the site.

Given the requirements for dual-spectrum 802.11n, voice support, and location tracking, a predictive survey can help in:

Estimating the number and placement of APs to ensure adequate coverage and capacity.

Planning for voice over WLAN (VoWLAN) by modeling for low-latency and seamless roaming.

Designing for location tracking by ensuring sufficient AP density and placement for accurate triangulation.