CWDP-304 Certified Wireless Design Professional Question and Answers

Name the audience type not addressed in this chapter for HLDs.

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What is the minimum PoE budget needed on a switch to support 6 (six) APs that can only be powered using IEEE 802.3at if no other details are provided?

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You are creating an outdoor bridge link that spans more than 1000 yards. Which one of the following antenna types is more likely to be included in

the design?

When performing an indoor predictive site survey to make the WLAN planning and design cycle more efficient, what is a best practice for

configuration of the simulated APs in the predictive modeling software?

What architecture suffers the biggest limitation for sharing control information across APs?

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In addition to a copy of your design, which tools should you use to ensure the installation team deploys APs where you have them designed to be

located?

What is a radome?

Your new customer is concerned about maintaining privacy for their proprietary information when you conduct information gathering for their

WLAN design. Which document can you use to directly address their concern?

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

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Aesthetics are very important in some environments. What common installation technique can be used to best meet this requirement in a

stadium?

You have initiated a site survey to be performed and the team has been onsite and is halfway through gathering the necessary data.

The project sponsor just asked you to make sure the WLAN supports radio frequency identification (RFID) location tracking. How would you possibly characterize this situation?

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A company wants to connect its headquarters to its remote office that is 13 kilometers away using a wireless bridge. What requirement must not

be forgotten by their Wireless Engineer when considering the Fresnel Zone?

What are the deliverables to your customer after successfully implementing a WLAN infrastructure?

A bandpass filter has a maximum in-band loss of 1.5 dB, ripple of 0.4 dB, and a return loss of 15 dB. What is the minimum in-band loss?

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Given: In a site survey deliverable report, you are expected to explain the spectrum measurements taken at the customers site. What portion of a

spectrum analyzer view can be used to determine if a given channel is too active for use as the active channel for a new AP?

What functions may be performed by a WIPS?(Choose all that apply.)

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The thermal noise is at −174 dBm/Hz. A spectrum analyzer has a resolution bandwidth of 1 kHz and a 5 dB noise figure. What is the level of the noise floor?

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What are some significant drawbacks that are present with WPA/WPA2-Enterprise that are not present with WPA/WPA2-Personal?(Choose all that apply.)

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While performing a validation site survey, you realize that overlapping channels are being used on the 2.4 GHz bad due to the automatic channel assignment algorithm of the WLAN infrastructure.

What should you do to prevent this?

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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?

After designing a WLAN infrastructure using predictive design software. What's the best way to validate the predictive design in the physical space

before deployment, if time and budget allow for it?

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

When performing an active site survey in an existing WLAN infrastructure, in addition to gathering throughput data, what other important function

will you typically be testing at the same time?

What kind of antenna results in a nearly circular pattern on the azimuth chart but a very flat donut shape on the elevation chart?

What metric implements the simplest algorithm and lowest accuracy in networks requiring locations?

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Using a SCA means that all APs will be using the same channel in a given layer. How is the AP with which the client associates determined?

As an implementation engineer, you have just received initial design specs from a network designer for your dual-band 802.11n deployment. The

network design documents prescribe the following data rate configuration for the 2.4 GHz radio:

Basic Rates 5.5, 6, 11, 12 Mbps

Supported Rates 9, 18, 24, 36, 48, and 54 Mbps as well as MCS 0-15

What will result from this design strategy?

What document is typically created to launch a project?

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When troubleshooting coverage issues for a wireless network as it appears to new client associations, you should perform which type of survey?

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You are working on a VoWLAN design with your customer's wired networking team. How many distinct priority levels do you expect for the voice

applications?

What type of protection should be provided to outdoor antenna installations?

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What kind of applications has the character traits of many communications back and forth between the server and client for each transaction initiated by the user?

For example, several files, images and other data files may be required to download to the client with each click from the user. Choose the best answer.

Response:

What limitation exists when WMM is not enabled on an 802.11n WLAN?

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Your customer is using PSK as their only authentication. They have an industry requirement to move to a stronger solution. Your recommendation

is to move to a certificate-based type of authentication where both the client and server require certificates. Which EAP type would be the best fit?

What is the meaning of a Real Time FFT graph?

ABC Manufacturing has a heavily-used dual-band (2.4 / 5 GHz) WLAN, but sporadic RF interference across the 2.4 GHz band is causing dropped

VoWiFi calls and leading to data connectivity and throughput problems.

In addition to avoiding 2.4 GHz channels and installing a distributed spectrum analyzer to locate RF interference sources, what should the

implementer do to resolve the problem fully?

Assume that your network operates in a regulatory domain that allows use of the entire 5 GHz space allowed in the 802.11ac amendment. In your

upcoming

802.11ac deployment, you would like to take advantage of the performance improvements that result from channel bonding. However, after

extensive testing, you have determined that your mission-critical WLAN should not use channels requiring DFS support.

Given those two criteria (enable channel bonding and disable DFS channels), in the 5 GHz spectrum, how many non-overlapping 40 MHz channels

will your system be able to use?

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)

What VoWiFi implementations frequently require multicast packet delivery support by the WLAN infrastructure?

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

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When designing for a PTP outdoor link, what important consideration should be made about local vegetation?(Choose all that apply.)

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Which of the following is not a business requirement?

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What basic RF math formula should be used as a baseline to convert an RF value in units of dBm into a value of mW?

*Note: "dBm" in the formulas represents the known dBm value

A customer is acquiring a new VoWLAN system to replace their existing wired phone system. When reading about his system's requirements, you

learned that is requires 25 db of SNR to work as expected. After surveying the environment, you discovered that the noise floor is -88 dBm. What

should be the minimum RSSI value to meet the system's requirements?

In 802.11, clients are required to be calibrated for RSSI and SNR reporting to:

You are validating association capabilities from clients to an 802.1X/EAP secure SSID. The RADIUS server's IP address is 10.100.50.25 and the

default RADIUS authentication port is used. When testing them, none of the clients are able to associate to the SSID. Troubleshooting the WLAN

infrastructure, you found out that the server is up and the RADIUS service is up as well, but the authenticator is not able to communicate properly

with the server. What's your next troubleshooting step?

Location technology (RTLS) can use which of the following methods?(Choose all that apply.)

Response:

You're about to deploy an Enterprise-class VoWLAN infrastructure. You need to ensure that QoS is properly configured throughout the network.

What Access

Category (AC) should voice frames/packets use?

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?

What might limit the ability to locate 802.11 clients using a WLAN infrastructure without an 802.11 tag?

When analyzing published competitive tests by equipment vendors, what items are the tests usually lacking?(Choose all that apply.)

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Which document provided to your customer should include all devices and parts that are going to be used during the deployment of their WLAN

infrastructure?

What advantages are provided by per-user PSKs when compared with ESS-wide PSKs?(Choose all that apply.)

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What important item is often left out of operational and maintenance plans?

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You and 10 other people are connected to a public hot-spot. You issue a ping sweep on the network, but you can't find any devices on the same

subnet as yours.

What feature might be enabled on the WLAN infrastructure that is preventing you from communicating with other devices on that subnet?

Your customer requires a security solution in which client credentials are used and the authentication server must have a certificate with optional

client certificate use. Which EAP method would be the best fit for their requirement?

An amplifier has a 1 dB compression point of 32 dBm and a gain of 20 dB. Which is the highest average input power shown here that would be safe to operate a 24 Mbps 802.11g signal so that spectral regrowth is not a problem?

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A cable with 2.5 dB of loss is used to measure the return loss of an antenna. The measured value in-band is shown to be larger than 20 dB. What is the actual return loss of the antenna, and is it considered to be a reasonable value?

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During lunch time in the break room of a company, Wi-Fi connectivity on the 2.4 GHz band is intermittent. Every other time of the day, it works fine. What's the likely cause of this issue?

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When live video streaming solutions that transmit simultaneously to more than one recipient are used, what special capability should be considered and configured in all affected WLAN implementations?

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You are being asked to design a WLAN for a number of WLAN clients that will use Telnet as the primary application. The customer has asked that you use only the number of APs necessary because of the complex installation and construction costs each AP installation will incur in this particular environment.

What design factors do you consider?

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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?

Before performing a pre-deployment passive RF survey of a new deployment using survey mapping software, which of the following must be performed?

When preparing a floor plan graphic for use in predictive and manual site surveying, what calibration method will lead to the most accurate and

reliable RF data?

When designing a WLAN to support voice in a large office, which design element is of the highest concern for performance?

A wireless engineer from your company performed a site survey in an office building where a wireless network extension was needed. He reports

that while performing a Layer 1 sweep near a meeting room full of people, he detected RF activity with a very low duty cycle. He is unsure how to

interpret what he recorded to determine its impact on a future Wi-Fi network.

What is true about this RF environment and its potential impact on the WLAN?