Free Practice Questions for CWNP CWDP-305 Exam

The maximum theoretical signal gain of chip-based TxBF and MRC depends on the number of antennas and the channel conditions. TxBF (transmit beamforming) is a technique that focuses the transmitted signal in the direction of the intended receiver, resulting in higher signal strength and less interference. MRC (maximum ratio combining) is a technique that combines the signals received by multiple antennas in an optimal way, resulting in higher signal-to-noise ratio and better performance. The theoretical gain of TxBF and MRC can be calculated as

GTxBF​=10log10​(N)

and

GMRC​=10log10​(N)

where N is the number of antennas. Therefore, the total gain of TxBF and MRC is

Gtotal​=GTxBF​+GMRC​=20log10​(N)

However, this is the ideal case and assumes perfect channel conditions and alignment. In reality, the gain is lower due to factors such as channel fading, antenna spacing, and feedback delay.According to the CWDP study guide1, the typical gain of TxBF and MRC is about 4-6.5 dBi for 2 antennas, 7-10 dBi for 3 antennas, and 10-13 dBi for 4 antennas.Therefore, the answer is D.References:1: CWDP Certified Wireless Design Professional Official Study Guide: Exam PW0-250, Chapter 8, page 267.

Comprehensive and Detailed Explanation:

In WLAN architecture, theManagement Planeis responsible for overseeing and configuring the network's operational aspects, including automated RF management tasks such as:

Dynamic Channel Assignment

Transmit Power Control

Load Balancing

Coverage Hole Detection and Correction

These functions ensure optimal performance and reliability of the wireless network by adapting to changing RF conditions.

In Wi-Fi networks, Quality of Service (QoS) is managed through the Wi-Fi Multimedia (WMM) specification, which categorizes traffic into four Access Categories (ACs):

AC_VO (Voice)

AC_VI (Video)

AC_BE (Best Effort)

AC_BK (Background)

Voice traffic is highly sensitive to latency and jitter, requiring the highest priority to ensure call quality. Therefore, voice frames should be mapped to theAC_VOcategory.

The CWDP-305 Official Study and Reference Guide emphasizes:

"Voice traffic should be assigned to the AC_VO category to ensure the highest priority and minimal latency."

802.1X/EAP preauthentication allows a client to authenticate with a new AP before roaming, reducing handoff latency. However, preauthentication typically requires that the new AP is within the same Layer 2 domain as the current AP. If the new BSS operates on a different IP subnet (Layer 3 domain), the STA may not attempt preauthentication due to the inability to establish a direct Layer 2 connection for the EAP exchange.

Comprehensive and Detailed Explanation:

Transitioning from a centralized to a distributed data forwarding model can introduce compatibility issues. Specifically:

C.Some APs designed for centralized architectures may lack the necessary hardware or firmware capabilities to support distributed forwarding features, such as local breakout or direct client-to-client communication, leading to potential limitations in functionality.

Received Signal Strength Indicator (RSSI) is a metric that measures the power level of a received radio signal.In the context of location-based services within wireless networks, RSSI-based localization is known for its simplicity, as it doesn't require additional hardware or complex algorithms.However, this simplicity comes at the cost of accuracy.RSSI measurements can be significantly affected by environmental factors such as multipath propagation, obstacles, and signal interference, leading to less precise location estimations compared to other methods like AoA, ToA, or TDoA.Wray Castle

A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar or antenna system. Constructed from materials transparent to radio waves, such as fiberglass, radomes shield antennas from environmental elements like wind, rain, and debris without interfering with signal transmission. They are commonly used in outdoor wireless deployments to ensure the longevity and performance of antenna systems.

As client density increases, the demand for IP address allocation also increases. In this scenario, the transition from a lightly used 802.11g environment to a high-density 802.11ax deployment (Wi-Fi 6) introduces a significantly larger number of devices.

From CWDP-305:

“DHCP scope exhaustion is a common issue in high-density environments. The DHCP server must be configured to support large address pools to ensure clients can successfully obtain IP addresses.”

Thus, verifying and possibly expanding DHCP pools is essential to prevent connection failures due to address depletion.

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

When the WLAN controller and APs reside on different subnets, a router is required to facilitate communication between them. The router enables Layer 3 routing, allowing the APs to discover and communicate with the controller across subnet boundaries.

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