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CWNP
CWDP Wi-Fi Design
CWDP-304
Certified Wireless Design Professional Questions and Answers

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Viewing questions 41-50 out of questions

Questions # 41:

You are conducting a physical site survey where heavy machinery is repaired. What is a common item required specifically for this type of survey?

Options:

Personal Protective Equipment (PPE)

Low gain antennas

Low power APs

Indoor APs

Answer

Questions # 42:

A WLAN that you designed has been deployed in one area, users ate complaining that the network performs poorly. When you analyze the area you see that a new interferer has been introduced that was not there during the pre-design survey You've been informed that the interferer cannot be removed as it is an essential loT device. What action do you recommend?

Options:

Reconfigure the channel plan to work around the interferer

increase the output power of the APs covering that area by at least 25 percent to overpower the interferer

Place a metal enclosure around the interferer

Use 40 MHz channels so that the devices can use either 20 MHz block depending on where the interferer operates

Answer

Questions # 43:

In what circumstance would you not enable DFS channels on a WLAN infrastructure?

Options:

In any stadium

In any office complex

In an airport

In any home office

Answer

Questions # 44:

To ensure that your design meets the requirements of the WLAN, what should be defined in your WLAN design software that will result in different requirements at varying locations on the floor plan1?

Options:

Requirement areas

Cable runs

Heatmap colors

Project name

Answer

Questions # 45:

What is the primary reason for avoiding 160 MHz channels with 802 11 in the 5 GHz band'?

Options:

Only two oi three 160 MHz channels exist in the current frequency allocation, tn some regulatory domains only one exists

The data rate becomes too high which causes some clients to gam access to the medium and never let it go

The output power requited for 160 MHz channels is more than most regulatory domains allow

No APs exist in production that can implement 160 MHz channels

Answer

Questions # 46:

Left to its simplest form, what method does a location algorithm use to determine location within a WLAN coverage area?

Response:

Options:

Inverse cube law

FSPL

RF fingerprinting

802.11 clause 16

Answer

Questions # 47:

You deployed an AP and installed its antenna, and you now need to set the AP transmit power. Given a desired EIRP of 21 dBm, and an antenna

gain of 5.85 dBd connected through 25 feet of cable with a loss specification of 4 dB/100 feet.

Assuming that there is no significant loss from the connectors, what should be the transmit power level for this AP?

Options:

10 mW

14 mW

20 mW

25 mW

Answer

Questions # 48:

When designing a static channel plan for an office using voice devices near an airport, which range of channels should be avoided to ensure

optimal performance when implemented?

Options:

36-40

44-48

116-124

1-11

Answer

Questions # 49:

Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This

exercise allows you to quantify the features value in a real-world environment.

What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single

antenna for transmit and receive (effectively simulating a 1x1 chip)?

Options:

2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = approx 5 dBi gain 4 Rx or Tx chains = 6 dBi gain

2 Rx or Tx chains = 1 dBi gain 3 Rx or Tx chains = 2 dBi gain 4 Rx or Tx chains = 3 dBi gain

2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = 6 dBi gain 4 Rx or Tx chains = 9 dBi gain

2 Rx or Tx chains = approx 4-6.5 dBi gain 3 Rx or Tx chains = approx 7-10 dBi gain

Answer

Explanation

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.

Questions # 50:

What is the chip rate of 1 Mbps 802.11b?

Response: