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  • Exam Name: Certified Wireless Network Administrator
  • Last Update: Mar 27, 2024
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CWNA-107 Certified Wireless Network Administrator Questions and Answers

Question # 6

You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term do you use to describe the problem in this configuration?

A.

Bluetooth interference

B.

Non-Wi-Fi interference

C.

CCI

D.

ACI

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Question # 7

When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

A.

Yagi

B.

Dipole

C.

Rubber ducky

D.

Isotropic radiator

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Question # 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 EIRP power output?

A.

2 W

B.

250 mW

C.

1000 mW

D.

500 mW

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Question # 9

You administer a small WLAN with nine access point. As a small business, you do not rum a RADIUS server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-personal in all Aps and clients. Several users are now reporting the inability to connect to the network at time and it is constrained to one area of the building. When using scanner, you see that the AP covering that area is online

A.

The AP that covers the problem area requires a firmware update

B.

The clients are improperly configured

C.

The AP that covers the problem area has failed

D.

The AP that covers the problem area is improperly configured

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Question # 10

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?

A.

Wooden doors

B.

Carpeted floors

C.

Elevators

D.

Cubicle partitions

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Question # 11

What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

A.

A single AP supports multiple BSSs with different SSIDs.

B.

An SCA network is in use.

C.

Multiple APs have been loaded with the same configuration from an image file.

D.

An IBSS is used instead of a BSS.

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Question # 12

You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not used and the controller is located at 10.10.10.81/24 while the AP is on the 10.10.16.0/24 network. What should be inspected to verify proper configuration?

A.

NTP

B.

BOOTH

C.

DNS

D.

AP hosts file

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Question # 13

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?

A.

WPAN

B.

Ad-hoc

C.

BSS

D.

IBSS

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Question # 14

Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?

A.

SIG

B.

VHT

C.

OFDM

D.

HT

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Question # 15

You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.

Based on this information, what is the likely cause of the problem?

A.

The laptop has a failing wireless adapter

B.

the AP is overloaded during the work day

C.

The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use

D.

The drives in the laptop are corrupt

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Question # 16

What standard is referenced in the 802.11-2016 specification and is recommended for robust WLAN client security?

A.

SSID hiding

B.

WEP

C.

802.1X/EAP

D.

IPSec VPN

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Question # 17

Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

A.

VHT (802.11ac)

B.

OFDM (802.11a)

C.

DSSS (802.11-Prime)

D.

HT (802.11n)

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Question # 18

What is the final step in an effective troubleshooting process?

A.

Document the results

B.

Disable the WLAN

C.

Notify the users of problem resolution

D.

Verify the solution

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Question # 19

You are evaluating access points for use in the 5GHz frequency band. What PHY supports this band and supports 80 MHz channels?

A.

OFDM

B.

HT

C.

VHT

D.

ERP

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Question # 20

You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzer?

A.

Frames with the HN bit set to 1

B.

Frames with the retry bit set to 0

C.

Frames transmitted from the AP without acknowledgement

D.

Retransmitted frames from multiple STAs at higher rates than other STAs

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Question # 21

You are evaluating access points for use in the 5 GHZ frequency band. What PHY supports this band and supports 80 MHz channels?

A.

OFDM

B.

HT

C.

VHT

D.

ERP

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Question # 22

What statement about the beamwidth of an RF antenna is true?

A.

Horizontal and vertical beamwidth are calculated at the point where the main lobe decreases power by 3 dB.

B.

Vertical beamwidth is displayed (in degrees) on the antenna’s Azimuth chart.

C.

When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.

D.

The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.

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Question # 23

What statement about 802.11 WLAN bridges is true?

A.

WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications

B.

WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally

C.

WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band

D.

WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge

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