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Test your basic knowledge |
CWNA Radio Frequency Components Measurements And Mathematics
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 23 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
watt
receive sensitivity
equivalent isotropically radiated power (EIRP)
unit of comparison
2. Used by a wireless device to determine if another device is transmitting - also known as a clear channel assessment. An optional 802.11 parameter with a value of 0 to 255. It is designed by the hardware manufacturer as a relative measurement of the R
transmitter
received signal strength indicator (RSSI)
intentional radiator (IR)
rule of 10s and 3s
3. A device that intentionally generates and emits radio frequency energy by radiation or induction
link budget
intentional radiator (IR)
milliwatt
watt
4. Gain or increase of power from an antenna when compared to what an isotropic radiator would generate. Another way of phrasing this is 'decibel gain relative to an isotropic radiator'
unit of comparison
point source
dBi
fade margin
5. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
decibel (dB)
milliwatt
watt
antenna
6. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
decibel (dB)
watt
dBm
equivalent isotropically radiated power (EIRP)
7. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
6 dB rule
unit of power
received signal strength indicator (RSSI)
8. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
point source
unit of power
Newton's Inverse Square Law
milliwatt
9. Doubling the distance between a transmitter and receiver will decrease the received signal by 6 dB. Halving the distance between a transmitter and receiver will increase the received signal by 6 dB
6 dB rule
rule of 10s and 3s
dBd
received signal strength indicator (RSSI)
10. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
fade margin
rule of 10s and 3s
watt
dBm
11. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
milliwatt
point source
system operating margin (SOM)
unit of power
12. A point that radiates signal equally in all directions. e.g. sun
watt
equivalent isotropically radiated power (EIRP)
Newton's Inverse Square Law
point source
13. Provides approximate values when performing RF math calculations. 4 rules
isotropic radiator
rule of 10s and 3s
equivalent isotropically radiated power (EIRP)
dBd
14. A level of desired signal above What is required
receiver
intentional radiator (IR)
fade margin
unit of comparison
15. The final component in a wireless medium. It takes the carrier signal that is received from the antenna and translates the modulated signals into 1s and 0s. it then takes this data and passes it to the computer to be processed
point source
link budget
receiver
antenna
16. Provides two functions in a communication system. When connected to the transmitter - it collects the AC signal that it receives from the trasmitter and directs - or radiates - the RF waves away from the antenna in a pattern specific to the antenna t
point source
antenna
Newton's Inverse Square Law
transmitter
17. A unit of power equal to 1/1000 of a watt
milliwatt
receive sensitivity
dBd
dBm
18. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
transmitter
dBm
unit of comparison
decibel (dB)
19. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
receiver
system operating margin (SOM)
link budget
milliwatt
20. The increase in gain of an antenna - conmpared to the signal of a dipole antenna. Another way of phrasing this is 'decibel gain relative to a dipole antenna'
link budget
rule of 10s and 3s
dBd
received signal strength indicator (RSSI)
21. The highest RF signal strength that is transmitted from a particular antenna
decibel (dB)
equivalent isotropically radiated power (EIRP)
received signal strength indicator (RSSI)
fade margin
22. This law states that the change in power is equal to 1 divided by the square of the change in distance
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23. A point source that radiates signal equally in all directions. e.g. sun
fade margin
isotropic radiator
dBd
receiver