Watchguard - Secure Wi-Fi Exam
Questions and Answers
What does a radio require? - Correct Answers -A transmitter, A receiver, the over-the-
air medium between the transmitter and receiver
2.4Ghz has a longer wavelength than 5Ghz but is more susceptible to interference. This
means... - Correct Answers -2.4Ghz has longer range and can penetrate floors and
walls.
Dynamic Frequency Selection (DFS) allows wireless devices to - Correct Answers -
share parts of the 5 and 6 Ghz frequency. A 5 and 6 Ghz device will use DFS to switch
channels if radar is detected.
2.4Ghz Bands - Correct Answers -802.11, 802.11b, 802.11g, 802.11n, 802.11ax
5 Ghz Bands - Correct Answers -802.11a, 802.11n, 802.11ac, 802.11ax
6 Ghz Bands - Correct Answers -Wi-Fi 6E
Beamforming is used with omnidirectional antennas - Correct Answers -to increase their
strength in the direction of the connected client devices
Spatial stream - Correct Answers -is a wireless data signal transmitted or received by
an antenna. The more antennas an access point has the more data it can
receive/transmit at one time
If the noise level is too high - Correct Answers -it can degrade the strength and
performance of your wireless signals.
Power loss can significantly affect - Correct Answers -the range and throughput of your
wireless devices.
Signal strength - Correct Answers -is the wireless signal power level received by a
wireless client. A strong signal strength results in more reliable connections and higher
speeds but can also cause interference with nearby devices.
A decibel (dB) - Correct Answers -is a relative measure of RF power.
, A watt - Correct Answers -is an absolute measure of RF power
The signal strength is represented in dBm format (0 to -100) - Correct Answers -This is
the power ratio in decibels (dB) of the measured power referenced to one milliwatt
(mW).
The closer the value is to 0 - Correct Answers -the stronger the signal. For example, -45
dBm is better signal strength than -65 dBm
The noise level is measured in dBm format (0 to -100 dBm) - Correct Answers -This is
the power ratio in decibels (dB) of the measured power referenced to one milliwatt.
The closer the value to 0, the greater the noise level - Correct Answers -Negative
values indicate less background noise. For example, -96 dBm is a lower noise level
than -20 dBm.
The signal-to-noise ratio (SNR) is - Correct Answers -the power difference between the
signal strength and the noise level.
SNR (signal-to-noise ratio) is represented as a - Correct Answers -dBm value. You
should have a minimum of +25 dBm signal-to-noise ratio. Lower values than +25 dBm
result in poor performance and speeds
If you have a -41 dBm signal strength, and a -50 dBm noise level - Correct Answers -
this results in a poor signal-to-noise ratio of +9 dBm
If you have a -41 dBm signal strength, and a -96 dBm noise level - Correct Answers -
this results in an excellent signal-to-noise ratio of +55 dBm
Must not only plan for coverage for the wireless signal but also - Correct Answers -the
types of applications that will be used and the types of wireless devices that will use
them. Such as a Macbook's wifi will be faster than a tablet.
Must determine use cases - Correct Answers -Such as a school requirements will be
different from a small business. Need to factor in types of data (video streams/web
browsing/webinars), how many devices will need to be connected to each AP, and how
fast those devices are.
A site survey helps determine - Correct Answers -the physical and airspace
characteristics of your environment.
Use heatmap tools before an install - Correct Answers -to help plan AP placement by
measuring signal strength from different locations.
Questions and Answers
What does a radio require? - Correct Answers -A transmitter, A receiver, the over-the-
air medium between the transmitter and receiver
2.4Ghz has a longer wavelength than 5Ghz but is more susceptible to interference. This
means... - Correct Answers -2.4Ghz has longer range and can penetrate floors and
walls.
Dynamic Frequency Selection (DFS) allows wireless devices to - Correct Answers -
share parts of the 5 and 6 Ghz frequency. A 5 and 6 Ghz device will use DFS to switch
channels if radar is detected.
2.4Ghz Bands - Correct Answers -802.11, 802.11b, 802.11g, 802.11n, 802.11ax
5 Ghz Bands - Correct Answers -802.11a, 802.11n, 802.11ac, 802.11ax
6 Ghz Bands - Correct Answers -Wi-Fi 6E
Beamforming is used with omnidirectional antennas - Correct Answers -to increase their
strength in the direction of the connected client devices
Spatial stream - Correct Answers -is a wireless data signal transmitted or received by
an antenna. The more antennas an access point has the more data it can
receive/transmit at one time
If the noise level is too high - Correct Answers -it can degrade the strength and
performance of your wireless signals.
Power loss can significantly affect - Correct Answers -the range and throughput of your
wireless devices.
Signal strength - Correct Answers -is the wireless signal power level received by a
wireless client. A strong signal strength results in more reliable connections and higher
speeds but can also cause interference with nearby devices.
A decibel (dB) - Correct Answers -is a relative measure of RF power.
, A watt - Correct Answers -is an absolute measure of RF power
The signal strength is represented in dBm format (0 to -100) - Correct Answers -This is
the power ratio in decibels (dB) of the measured power referenced to one milliwatt
(mW).
The closer the value is to 0 - Correct Answers -the stronger the signal. For example, -45
dBm is better signal strength than -65 dBm
The noise level is measured in dBm format (0 to -100 dBm) - Correct Answers -This is
the power ratio in decibels (dB) of the measured power referenced to one milliwatt.
The closer the value to 0, the greater the noise level - Correct Answers -Negative
values indicate less background noise. For example, -96 dBm is a lower noise level
than -20 dBm.
The signal-to-noise ratio (SNR) is - Correct Answers -the power difference between the
signal strength and the noise level.
SNR (signal-to-noise ratio) is represented as a - Correct Answers -dBm value. You
should have a minimum of +25 dBm signal-to-noise ratio. Lower values than +25 dBm
result in poor performance and speeds
If you have a -41 dBm signal strength, and a -50 dBm noise level - Correct Answers -
this results in a poor signal-to-noise ratio of +9 dBm
If you have a -41 dBm signal strength, and a -96 dBm noise level - Correct Answers -
this results in an excellent signal-to-noise ratio of +55 dBm
Must not only plan for coverage for the wireless signal but also - Correct Answers -the
types of applications that will be used and the types of wireless devices that will use
them. Such as a Macbook's wifi will be faster than a tablet.
Must determine use cases - Correct Answers -Such as a school requirements will be
different from a small business. Need to factor in types of data (video streams/web
browsing/webinars), how many devices will need to be connected to each AP, and how
fast those devices are.
A site survey helps determine - Correct Answers -the physical and airspace
characteristics of your environment.
Use heatmap tools before an install - Correct Answers -to help plan AP placement by
measuring signal strength from different locations.
