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CWNA Questions and Correct Answers
the Latest Update
Q. what word describes the bending of an RF signal as it passes through a
medium of a varying density from that of free space
✓ Refraction
Q. What can cause an excessively high VSWR (voltage standing wave ratio)in a
WLAN RF transmission line?
✓ An impedance mismatch in the RF cables and connectors
Q. What factors influence the distance that an RF signal can be effectively
received?
✓ *Receiving station's radio sensitivity
✓ *Free Space Path Loss
✓ *Transmitting station's output power
Q. As an RF wave propagates through space, the wave front experiences natural
expansion that reduces its signal strength in an area. what term describes the
rate at which this expansion happens?
✓ Inverse square law
Q. Return Loss is the decrease of forward energy in a system when some of the
power is being reflected back toward the transmitter.
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✓ Am impedance mismatch between components in the RF system
Q. What factors are taken into account when calculating the link budget of a
point-to-point outdoor WLAN bridge link?
✓ * operating frequency
✓ * transmit antenna gain
✓ * transmit power
Q. A WLAN transmitter that emits a 200mW signal is connected to a cable
with 3dB loss. If the cable is connected to and antenna with a 10dBi gain, what is
the EIRP at the antenna element?
✓ 30dBm
Q. In a long-distance RF link, what statement about Fade Margin is true?
✓ Fade Margin is an additional pad of signal strength designed into the RF system to
compensate for unpredictable signal fade.
Q. Which unit of measurement is an absolute unit that is used to quantify power
levels on a linear scale?
✓ dBm
Q. An 802.11 WLAN transmitter that emits a 50mW signal is connected to a
cable with 3dB of loss. The cable is connected to an antenna with 16 dBi of gain
What is the EIRP power output?
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✓ 1000mW
Q. What is always required to establish a high quality 2.4GHz RF link at a
distance of 3 miles (5kilometers)?
✓ A Fresnel Zone that is at least 60% clear of obstructions
Q. What phrase defines Equivalent Isotropic Radiated Power (EIRP)?
✓ The highest RF signal strength that is transmitted from a given antenna
Q. What term describes the effect of increasing the intensity of an RF wave with
an antenna by focusing the energy in a specific direction?
✓ Passive Gain
Q. Which antenna types are commonly used by indoor Wi-Fi devices in a MIMO
diversity implementation?
✓ * Dipole
✓ * Patch
Q. When using WMM Power Save operation, a wireless client device
_______________________________.
✓ Alternates between awake and dozing, depending on its need to transmit and receive
information
Q. When replacing the antenna of a WLAN device with a similar antenna type
that has a higher passive gain, what antenna characteristic will decrease?
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✓ Beamwidth
Q. What statements about the beamwidth of an RF antenna are true?
✓ * Horizontal and vertical beamwidth are calculated at the points in which the main
lobe decreases power by 3dB.
✓
✓ * Horizontal beamwidth is displayed (in degrees) on the antennas's Azimuth Chart.
Q. What HT technology requires MIMO support on both the transmitter and
receiver?
✓ Spatial multiplexing
Q. ABC Company has just purchased a 6 dBi patch antenna. After performing
some tests with the 6 dBi antenna, they have concluded that more antenna gain
is needed to cover their outdoor courtyard. When choosing an antenna with
higher gain, what other antenna characteristic will also
always change?
✓ Beamwidth
Q. AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of
spatial streams that can be used for a downlink HT-OFDM transmission from
AP-1 to STA-3?
✓ Two spatial streams, because the definition of the AP indicates that it is capable of
only two spatial streams.
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CWNA Questions and Correct Answers
the Latest Update
Q. what word describes the bending of an RF signal as it passes through a
medium of a varying density from that of free space
✓ Refraction
Q. What can cause an excessively high VSWR (voltage standing wave ratio)in a
WLAN RF transmission line?
✓ An impedance mismatch in the RF cables and connectors
Q. What factors influence the distance that an RF signal can be effectively
received?
✓ *Receiving station's radio sensitivity
✓ *Free Space Path Loss
✓ *Transmitting station's output power
Q. As an RF wave propagates through space, the wave front experiences natural
expansion that reduces its signal strength in an area. what term describes the
rate at which this expansion happens?
✓ Inverse square law
Q. Return Loss is the decrease of forward energy in a system when some of the
power is being reflected back toward the transmitter.
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✓ Am impedance mismatch between components in the RF system
Q. What factors are taken into account when calculating the link budget of a
point-to-point outdoor WLAN bridge link?
✓ * operating frequency
✓ * transmit antenna gain
✓ * transmit power
Q. A WLAN transmitter that emits a 200mW signal is connected to a cable
with 3dB loss. If the cable is connected to and antenna with a 10dBi gain, what is
the EIRP at the antenna element?
✓ 30dBm
Q. In a long-distance RF link, what statement about Fade Margin is true?
✓ Fade Margin is an additional pad of signal strength designed into the RF system to
compensate for unpredictable signal fade.
Q. Which unit of measurement is an absolute unit that is used to quantify power
levels on a linear scale?
✓ dBm
Q. An 802.11 WLAN transmitter that emits a 50mW signal is connected to a
cable with 3dB of loss. The cable is connected to an antenna with 16 dBi of gain
What is the EIRP power output?
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✓ 1000mW
Q. What is always required to establish a high quality 2.4GHz RF link at a
distance of 3 miles (5kilometers)?
✓ A Fresnel Zone that is at least 60% clear of obstructions
Q. What phrase defines Equivalent Isotropic Radiated Power (EIRP)?
✓ The highest RF signal strength that is transmitted from a given antenna
Q. What term describes the effect of increasing the intensity of an RF wave with
an antenna by focusing the energy in a specific direction?
✓ Passive Gain
Q. Which antenna types are commonly used by indoor Wi-Fi devices in a MIMO
diversity implementation?
✓ * Dipole
✓ * Patch
Q. When using WMM Power Save operation, a wireless client device
_______________________________.
✓ Alternates between awake and dozing, depending on its need to transmit and receive
information
Q. When replacing the antenna of a WLAN device with a similar antenna type
that has a higher passive gain, what antenna characteristic will decrease?
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✓ Beamwidth
Q. What statements about the beamwidth of an RF antenna are true?
✓ * Horizontal and vertical beamwidth are calculated at the points in which the main
lobe decreases power by 3dB.
✓
✓ * Horizontal beamwidth is displayed (in degrees) on the antennas's Azimuth Chart.
Q. What HT technology requires MIMO support on both the transmitter and
receiver?
✓ Spatial multiplexing
Q. ABC Company has just purchased a 6 dBi patch antenna. After performing
some tests with the 6 dBi antenna, they have concluded that more antenna gain
is needed to cover their outdoor courtyard. When choosing an antenna with
higher gain, what other antenna characteristic will also
always change?
✓ Beamwidth
Q. AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of
spatial streams that can be used for a downlink HT-OFDM transmission from
AP-1 to STA-3?
✓ Two spatial streams, because the definition of the AP indicates that it is capable of
only two spatial streams.
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