CWDP-305 Exam Dumps - CWNP CWDP Wi-Fi Design Questions and Answers

Orthogonal Frequency Division Multiple Access (OFDMA), introduced in 802.11ax, enhances efficiency by dividing a channel into smaller sub-channels called Resource Units (RUs). This allows multiple devices to transmit simultaneously within the same channel bandwidth, reducing latency and improving throughput. Unlike previous standards like 802.11n and 802.11ac, which primarily support single-user transmissions per channel, OFDMA's ability to handle multiple concurrent transmissions without relying on MU-MIMO leads to more efficient spectrum utilization and better performance in dense environments.

When conducting a site survey, accurately determining ceiling heights is crucial for proper AP placement and coverage prediction.If ladder use is restricted, utilizing a laser distance meter provides a precise and cost-effective solution.Laser measures can quickly and safely determine vertical distances without the need for physical elevation.گروه آموزشی و پژوهشی سیب

The CWDP-305 Official Study and Reference Guide emphasizes:

"Laser distance meters are valuable tools during site surveys, allowing for accurate measurements of ceiling heights and other distances without the need for ladders or lifts."

EAP-TLS (Extensible Authentication Protocol-Transport Layer Security) is considered one of the most secure EAP methods. It requires both the client and the server to have certificates, enabling mutual authentication. This method eliminates the need for passwords, reducing the risk of credential theft.

EAP-TTLS allows for server-side certificates and can use passwords for client authentication, making it less secure than EAP-TLS.

PEAP encapsulates EAP within a TLS tunnel, typically using server certificates and password-based client authentication.

Comprehensive and Detailed Explanation:

When discrepancies are found between the physical environment and the CAD drawings during a site survey, it's crucial to update the documentation to reflect the current state accurately. Redrawing the portions of the map that have changed ensures that the design and subsequent deployment are based on accurate information, leading to a more reliable and efficient wireless network.

Comprehensive and Detailed Explanation:

When transitioning from a centralized to a distributed data forwarding model in a WLAN architecture, it's important to consider the capabilities of the existing APs. Some APs designed specifically for centralized forwarding may lack the necessary hardware or firmware support to operate effectively in a distributed forwarding mode. This can lead to compatibility issues and may require hardware upgrades or replacements to ensure proper functionality in the new architecture.

For long-range point-to-point bridge links, dish antennas are preferred due to their narrow beamwidth and high gain. An 11 dBi dish antenna focuses energy more efficiently in a single direction, which reduces the amount of Intentional Radiator (IR) power needed to meet link budget requirements.

From CWDP-305:

“Dish antennas provide high gain and a narrow beam, making them ideal for point-to-point bridge links over long distances. This minimizes interference and maximizes EIRP efficiency.”

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

Comprehensive and Detailed Explanation:

Real Time FFT stands for Real Time Fast Fourier Transform.It is a spectrum analysis tool that displays the maximum signal amplitude detected at each frequency in real time.This visualization helps in identifying transient RF events, such as sporadic interference or brief signal spikes, which might not be captured in averaged spectrum analyses.By providing immediate feedback on the RF environment, Real Time FFT graphs are invaluable for troubleshooting and optimizing WLAN performance.

In the 2.4 GHz band, there are only three non-overlapping channels (1, 6, 11). Overuse of radios on the same or overlapping channels results in excessive co-channel interference (CCI), leading to contention and degraded throughput. The CWDP-305 Study Guide advises minimizing the number of active radios in the 2.4 GHz band in dense environments.

Turning off 2.4 GHz radios on some APs is the recommended action to reduce CCI without introducing adjacent-channel interference (ACI), which would occur if you used overlapping channels like 3, 4, or 8. This adjustment retains channel reuse efficiency and supports low-density legacy devices. It’s especially relevant in designs that primarily target 5 GHz or 6 GHz but include 2.4 GHz for backward compatibility.

An AP-on-a-Stick (APoS) survey is a method used to validate predictive WLAN designs by temporarily placing an access point at the planned installation location and measuring its performance in the actual environment. This approach helps in confirming the accuracy of the predictive model and ensures that the AP placement will meet the desired coverage and performance requirements.

Comprehensive and Detailed Explanation:

The 802.11 amendments that address regulatory and transmission requirements are:

C. 802.11d:This amendment provides country-specific information, allowing devices to operate in compliance with local regulations regarding frequency use and power levels.

E. 802.11h:Introduced to address spectrum and transmission power management in the 5 GHz band, this amendment includes features like Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) to mitigate interference with radar systems and adhere to regulatory requirements.

A. 802.11kfocuses on radio resource management.

B. 802.11ipertains to security enhancements.

D. 802.11fdeals with inter-access point protocol for roaming.