Newly Released CWNP CWDP-305 Exam PDF

In environments with low Signal-to-Noise Ratio (SNR), maintaining reliable communication becomes challenging due to increased potential for errors.Receive Diversityis a technique employed to enhance signal reception under such conditions.

Receive Diversity involves using multiple antennas at the receiver to capture the same signal.By combining these multiple received signals, the system can mitigate the effects of fading and interference, effectively improving the SNR.This enhancement leads to better throughput as the likelihood of retransmissions due to errors decreases.

Other options like 64-QAM require high SNR to function effectively, and A-MSDU frame aggregation is more beneficial in high SNR environments where larger frames can be transmitted without significant error.

Conducting a post-deployment survey before all APs are installed—particularly in a multi-floor environment—may yield incomplete results. APs from other floors can influence coverage (due to bleed-through floors), roaming behavior, and channel planning, so the validation should ideally happen after full deployment.

From CWDP-305:

“In multi-floor environments, APs from upper and lower floors contribute to the RF landscape. Validation should wait until all APs are installed to evaluate the WLAN's full performance characteristics.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

After deploying a WLAN as per the design specifications, conducting a post-installation survey is crucial.This survey verifies that the implemented network meets the design objectives, such as coverage, capacity, and performance.It helps identify any discrepancies between the predicted and actual performance, allowing for necessary adjustments to optimize the WLAN.

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.