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WATCHGUARD - SECURE WIFI EXAM
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WATCHGUARD - SECURE WIFI EXAM
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WATCHGUARD - SECURE WIFI EXAMWhat does a radio require? - 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... - Answers-2.4Ghz has longer range and can penetrate floors and walls.
Dynamic Frequency Selection (DFS) allows wireless devices to - 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 - Answers-802.11, 802.11b, 802.11g, 802.11n, 802.11ax
5 Ghz Bands - Answers-802.11a, 802.11n, 802.11ac, 802.11ax
6 Ghz Bands - Answers-Wi-Fi 6E
Beamforming is used with omnidirectional antennas - Answers-to increase their strength
in the direction of the connected client devices
Spatial stream - 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
The closer the value is to 0 - 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) - 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 - 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 - Answers-the power difference between the signal
strength and the noise level.
SNR (signal-to-noise ratio) is represented as a - 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 - 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 - 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 - 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 - 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 - Answers-the physical and airspace characteristics of
your environment.
Use heatmap tools before an install - Answers-to help plan AP placement by measuring
signal strength from different locations.
Use heatmap tools after install - Answers-to make adjustments and access real-world
signal strength and range.
Use Predictive Site Survey tools with an - Answers-accurate floorplan to help with AP
placement and channel planning.
A Manual Site Survey can be done using - Answers-just a smartphone to measure
signal strength.
If the noise level is too high - Answers-it can degrade the strength and performance of
your wireless signals.
Power loss can significantly affect - Answers-the range and throughput of your wireless
devices.
Signal strength - 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) - Answers-is a relative measure of RF power.
A watt - Answers-is an absolute measure of RF power
The signal strength is represented in dBm format (0 to -100) - Answers-This is the
power ratio in decibels (dB) of the measured power referenced to one milliwatt (mW).
Asses building materials such as - Answers-wood or concrete and EMI from nearby
wireless devices and electrical equipment.
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