CWNA-107 Online Practice Questions and Answers

You are reporting on the RF environment in you facility. The manager asks you do describe the noise floor noted in the report. Which of the following is the best explanation?

A. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.

B. The noise caused by elevators, microwave ovens, and video transmitters.

C. The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the Intentional signal of your WLAN must exist.

D. The extra energy radiated by access points and client devices beyond that intended for the signal.

The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The user indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both 2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?

A. Use a 160 MHz channel on the 5 GHz radio

B. Use a 40 MHz channel on the 5 GHz radio

C. Install a second AP in the coverage area

D. Use a 40 MHz channel on the 2.4 GHz radio.

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?

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

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

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

You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

A. Video camera

B. Access point

C. VoIP phone

D. Ethernet switch

In which plane of the three networking planes is an access point configured by a WLAN controlled?

A. Control

B. Management

C. Security D. Data

What security method is commonly used for VoIP handsets when the infrastructure does not support OKC or FT roaming?

A. WPA2-Enterprise with EAP-TTLS

B. WPA2-Enterprise with EAP-TLS

C. WPA2-Enterprise with PEAP

D. WPA2-Personal

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?

A. Install iPerf

B. Install WinPCAP

C. Calibrate the floor plan

D. Nothing, you can simply start capturing signal readings

When an ACK frame is not received by the transmitting STA, what is assumed?

A. The frame was correctly delivered

B. The frame was not delivered and must be retransmitted

C. The receiver is offline

D. The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled

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?

A. IBSS

B. WPAN

C. Access BSS

D. Wireless bridging

You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

A. Video camera

B. Access point

C. VoIP phone

D. Ethernet switch

You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your 2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIDs, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?

A. Interference from non-Wi-Fi sources

B. Faulty drivers

C. DoS attack

D. Interference from other WLANs

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

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

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

A. Grid antennas at each endpoint

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

C. A minimum antenna gain of 11 dBi at both endpoints

D. Minimum output power level of 2 watts