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CWNA-109 Certified Wireless Network Administrator Questions and Answers

Questions 4

A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?

Options:

A.

26 dBm

B.

13 dBm

C.

23 dBm

D.

10 dBm

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Questions 5

In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?

Options:

A.

WAN interface analysis results

B.

Capacity analysis results

C.

Application Layer protocol availability analysis results

D.

Layer 4 protocol availability analysis results

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Questions 6

When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?

Options:

A.

USB 3 devices in the user’s work area

B.

Bluetooth devices in the user’s work area

C.

Excess RF energy from a nearby AP

D.

Unintentional radiation from the PC power supply

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Questions 7

You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

Options:

A.

Channel 6, because it is always best to use this channel

B.

A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision

C.

Channel 1, because it is best to use the channel with the lowest frequency

D.

Channel 11, because channels 1 and 6 are in use nearby

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Questions 8

An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the power level at the Intentional Radiator?

Options:

A.

25 mW

B.

250 mW

C.

500 mW

D.

1000 mW

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Questions 9

You are using a site survey tool for post-implementation validation. You have installed the appropriate adapter driver and imported a floor plan. Now, you want to take the next step in proper tool use. What must you do before gathering survey data after the floor plan is imported?

Options:

A.

Calibrate the floor plan

B.

Install WinPCAP

C.

Nothing, you can simply start capturing signal readings

D.

Install iPerf

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Questions 10

In a long-distance RF link, what statement about Fade Margin is true?

Options:

A.

A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.

B.

The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.

C.

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.

D.

The Fade Margin of a long-distance radio link should be equivalent to the receiver’s low noise filter gain.

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Questions 11

You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but is does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel 52 in the same work areas. What is the likely problem?

Options:

A.

The clients are configured to use WPA and 5 GHz channels only support WPA2.

B.

The client drivers are faulty and should be upgraded.

C.

The antennas in the laptop have insufficient gain to detect the 5 GHz signals.

D.

The access points are configured to disallow 5 GHz.

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Questions 12

You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2016 standard that was not available before the ratification of 802.11 ac?

Options:

A.

56

B.

161

C.

153

D.

144

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Questions 13

Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. Assuming no other APs are in the vicinity, is CCI still a possibility in this network and why?

Options:

A.

Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP.

B.

No, because the APs are far enough apart that no CCI will occur.

C.

No, because CCI only occurs in the 5 GHz frequency band.

D.

Yes, because channel 11 loops around and causes CCI with channel 1.

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Questions 14

A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?

Options:

A.

MSK

B.

WEP key

C.

Passphrase

D.

PSK

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Questions 15

What feature of 802.1 lax (HE) may impact design decisions related to AP placement and the spacing between same-channel BSS cells (3SAs) because it is designed to reduce overlapping BSS contention?

Options:

A.

TWT

B.

BSS Color

C.

uplink MU-MIMO

D.

6 GHz band support

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Questions 16

When implementing PoE, what role is played by a switch?

Options:

A.

PSE

B.

Midspan injector

C.

PD

D.

Power splitter

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Questions 17

The requirements for a WLAN you are installing state that it must support unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?

Options:

A.

VoIP

B.

E-Mail

C.

FTP

D.

RTLS

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Questions 18

Which one of the following channels can be used for VHT transmissions according to the 802.11 specification?

Options:

A.

6

B.

144

C.

1

D.

11

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Questions 19

You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

Options:

A.

His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.

B.

His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.

C.

His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.

D.

Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.

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Questions 20

In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other client stations are actively communicating in the same BSS?

Options:

A.

802.11 DOS prevention

B.

OFDMA

C.

CSMA/CD

D.

CSMA/CA

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Questions 21

An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop. What WLAN use case is represented?

Options:

A.

Ad-hoc

B.

WPAN

C.

BSS

D.

IBSS

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Questions 22

What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Options:

A.

Shared Key Authentication

B.

Open System Authentication

C.

CCMP

D.

AES

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Questions 23

You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection. What common problem causes this scenario?

Options:

A.

NTP issues

B.

Hardware issues

C.

IP routing issues

D.

Captive portal issues

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Questions 24

As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area. What describes the rate at which this expansion happens?

Options:

A.

Fresnel zone thinning

B.

Ohm's law

C.

Inverse square law

D.

MU-MIMO

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Questions 25

What can cause excessive VSWR in RF cables used to connect a radio to an antenna?

Options:

A.

High gain yagi antenna

B.

Radio output power above 100 mW but below 400 mw

C.

High gain parabolic dish antenna

D.

Impedance mismatch

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Questions 26

When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

Options:

A.

Each AP responds in turn after preparing a probe response and winning contention.

B.

For each probe request frame, only one AP may reply with a probe response.

C.

Each AP checks with the DHCP server to see if it can respond and then acts accordingly.

D.

After waiting a SIFS, all APs reply at the same time with a probe response.

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Questions 27

A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points. What is the best method, of those listed, for implementation of a network back-haul for communications across the Internet in this

scenario?

Options:

A.

802.11 bridging to the response team headquarters

B.

Cellular/LTE/5G

C.

Turn up the output power of the WLAN at the response team headquarters

D.

Temporary wired DSL

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Questions 28

You are attempting to explain RF shadow and how it can cause lack of coverage. What common building item frequently causes RF shadow and must be accounted for in coverage plans?

Options:

A.

Wooden doors

B.

Carpeted floors

C.

Elevators

D.

Cubicle partitions

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Questions 29

You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test?

Options:

A.

iPerf

B.

PuTTy

C.

IxChariot

D.

Python

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Questions 30

A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

Options:

A.

30 W

B.

12.95 W

C.

25.5 W

D.

15.4 W

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Questions 31

What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?

Options:

A.

Minimum output power level of 2 W

B.

Grid antennas ateach endpoint

C.

A minimum antenna gain of 11 dBi at both endpoints

D.

A Fresnel Zone that is at least 60% clear of obstructions

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Questions 32

You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy?

Options:

A.

WPAN

B.

IBSS

C.

Wireless bridging

D.

Access BSS

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Questions 33

What is the final step in an effective troubleshooting process?

Options:

A.

Disable the WLAN

B.

Verify the solution

C.

Notify the users of problem resolution

D.

Document the results

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Questions 34

Which IEEE 802.11 physical layer (PHY) specification includes support for operation in the 2.4 GHz, 5 GHz, and 6 GHz bands?

Options:

A.

VHT (802.11ac).

B.

HT(802.11n)

C.

HR/DSSS (802.11b)

D.

HE (802.11ax)

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Questions 35

In a mesh BSS (MBSS), according to the 802.11 standard, what device connect the mesh to an Ethernet network?

Options:

A.

Mesh Gate

B.

Mesh Switch

C.

Mesh Router

D.

Mesh Portal

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Questions 36

What security option for 802.11 networks supports SAE and requires protected management frames?

  • WPA

Options:

A.

WPA2

B.

WPA3

C.

OWE

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Exam Code: CWNA-109
Exam Name: Certified Wireless Network Administrator
Last Update: Dec 3, 2024
Questions: 122

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