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

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Questions # 51:

During a post-deployment verification, you are requested to troubleshoot an area where users are experiencing poor throughput. They are using

data communication only, mainly from laptops. You captured the frame showing an incorrect FCS. This frame is typical of those that were

captured by the analyzer.

What does this frame reveal about the RF network in this area?

Options:

One station seems to be streaming video, thus may have reserved significant bandwidth via admission control

Contention Free is in place in this network, which may starve some non-QoS stations from access

Multipath or excessive collisions seem to be an issue in this area

The AP seems to be too far to provide enough coverage to this area

Answer

Questions # 52:

For what purpose is SSID hiding generally useful?(Choose all that apply.)

Response:

Options:

Preventing guests from attempting to join the secured corporate network

Obscuring the network name from potential attackers

Minimizing help desk calls from users and guests attempting to join the wrong network

Preventing legitimate corporate users from finding the guest network

Answer

A, C

Questions # 53:

You desire to achieve a 450 Mbps MCS. What 802.11n features (from the numbered list below) are required?

1. Frame aggregation

2. Short GI

3. 40 MHz channels

4. 2 spatial streams

5. 3 spatial streams

6. Transmit beamforming (TxBF)

Options:

2, 3, 2

1, 2, 3, 5

1, 2, 3, 4, 6

2, 3, 5

Answer

Questions # 54:

What best describes ensuring coverage requirements in a deployed WLAN?

Options:

Measuring the signal strength and number of APs at each location and comparing it to the requirement specifications

Verifying that the WLAN can be seen from all required locations

Verifying that you can connect to the WLAN from all required locations with the least capable device

Verifying that a 3x3:3 gaming laptop can connect to the WLAN from all required locations

Answer

Questions # 55:

You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminary WLAN design specifies support for the 5

GHz spectrum, you would like to test for radar pulses to determine if DFS channels should be supported at this facility. As a part of your spectral

survey with a laptop-based analyzer, you include DFS testing to identify the presence of radar. This is done by manually observing Real-time FFT,

Duty Cycle, and Active Devices charts of the spectrum analyzer software.

What potential drawback is present with this DFS test method?

Options:

Many WLAN products that support DFS channels report several false positives. Ideally, the actual WLAN equipment used in the deployment

should be used to test for DFS.

Some sources of 5 GHz radar, such as military ships, are mobile in nature. A longer, automated test setup should be used to identify the

presence or absence of radar.

Manual identification of radar pulses using spectrum analysis charts can be very difficult due to radar's low amplitude at the Wi-Fi receiver.

Modern spectrum analyzer adapters do not provide the necessary bandwidth resolution required to detect and measure radar signatures.

Answer

Questions # 56:

Given A project parameter defines a requirement or constraint (or a project that can be defined before any file imports or design actions. What is an example of a project parameter commonly available in WLAN design software?

Options:

AP locations

Minimum required signal strength

AP type selection

Floor plan

Answer

Questions # 57:

In your company’s WLAN, you expect to have a mixed client PHY environment and plan to use protection mechanisms. The protection mechanism used by your client devices is configurable.

What is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices?

Response:

Options:

WMM Protection

SMPS

CTS-to-Self

Dual-CTS

RTS/CTS

Answer

Explanation

RTS/CTS is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices because it prevents collisions and interference between different modulation types. 802.11n devices use OFDM, while 802.11b devices use DSSS. These two modulation types are not compatible with each other, but they can coexist in the same environment if they use protection mechanisms to avoid overlapping transmissions. RTS/CTS is a protection mechanism that requires a station to send a Request to Send (RTS) frame before transmitting data, and wait for a Clear to Send (CTS) frame from the receiver or the access point. The RTS and CTS frames are sent at a clause 15 (DSSS) or clause 18 (HR/DSSS) rate, which can be understood by both 802.11n and 802.11b devices. The RTS and CTS frames also contain a duration field that indicates how long the data transmission will last. This way, other stations can defer their transmissions until the channel is clear. RTS/CTS reduces the chances of collisions and hidden node problems, and improves the performance and reliability of the wireless network. References: CWNP, CWDP Certified Wireless Design Professional Official Study Guide, How 802.11n backward compatibility works

Questions # 58:

What is the most suitable antenna option to be used when designing a WLAN infrastructure with APs mounted on a ceiling with a height of more than 20 feet and having all of the client stations used from the floor?

Response:

Options:

Patch

Dish

Low-gain dipole

Grid

Answer

Questions # 59:

As a device starts to shift to lower PHY rates, what factors usually influence a device decision to shift to lower PHY rates?(Choose all that apply.)

Options:

Signal degradation

Packet loss

Interference

Retransmissions

Answer

A, B, C, D

Questions # 60:

What statements are true regarding jitter and latency?(Choose all that apply.)

Response:

Options:

Jitter is a measurement of latency variability from one frame to another.

Jitter is a measurement of the variance of the number of frames received from an application for a specific time interval.

Jitter is a measurement of average latency based on a sample of >100 frames.

Latency is a measurement of the time delay experienced in the delivery of a frame.

Latency is a measurement of the time required to transmit two subsequent frames.

Answer

A, D

Explanation

Jitter and latency are two important metrics for measuring the quality and performance of wireless networks, especially for real-time applications such as voice and video. Latency is the average time taken for a data packet to reach the destination, while network jitter is the irregularity in latency. When the latency is consistently high, it can mean a slow but stable connection. On the other hand, a high jitter means there may be sporadic disruptions or delays in the transmission, which can affect the quality of service and user experience. Jitter is caused by various factors, such as network congestion, interference, routing changes, hardware issues, or packet prioritization. Jitter can be measured by calculating the difference between the latency of two consecutive packets, or by using the standard deviation of the latency of a sample of packets. Jitter can be reduced by using Quality of Service (QoS) mechanisms, such as traffic shaping, queuing, or scheduling, which can prioritize the packets based on their importance and sensitivity to delay. Jitter can also be mitigated by using jitter buffers, which can store the incoming packets and smooth out the variations in latency before delivering them to the application. References: CWNP, CWDP Certified Wireless Design Professional Official Study Guide, Network Jitter - Common Causes and Best Solutions, Network Jitter vs Latency: What’s the Difference and Why Does It Matter, Jitter vs Latency - What’s The Difference and Why it Matters

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