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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. 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
received signal strength indicator (RSSI)
receiver
antenna
equivalent isotropically radiated power (EIRP)
2. The highest RF signal strength that is transmitted from a particular antenna
link budget
isotropic radiator
milliwatt
equivalent isotropically radiated power (EIRP)
3. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
fade margin
point source
equivalent isotropically radiated power (EIRP)
4. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
intentional radiator (IR)
dBd
unit of power
transmitter
5. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
equivalent isotropically radiated power (EIRP)
unit of power
isotropic radiator
decibel (dB)
6. 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'
dBd
unit of power
unit of comparison
6 dB rule
7. 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
rule of 10s and 3s
dBm
6 dB rule
point source
8. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
dBm
milliwatt
point source
rule of 10s and 3s
9. A point source that radiates signal equally in all directions. e.g. sun
intentional radiator (IR)
decibel (dB)
link budget
isotropic radiator
10. 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
received signal strength indicator (RSSI)
link budget
equivalent isotropically radiated power (EIRP)
unit of comparison
11. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
unit of power
intentional radiator (IR)
dBd
decibel (dB)
12. This law states that the change in power is equal to 1 divided by the square of the change in distance
13. Provides approximate values when performing RF math calculations. 4 rules
watt
unit of power
dBi
rule of 10s and 3s
14. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
point source
unit of comparison
system operating margin (SOM)
equivalent isotropically radiated power (EIRP)
15. A point that radiates signal equally in all directions. e.g. sun
dBi
point source
watt
received signal strength indicator (RSSI)
16. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
milliwatt
unit of comparison
watt
dBd
17. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
antenna
system operating margin (SOM)
receive sensitivity
dBi
18. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
watt
link budget
intentional radiator (IR)
system operating margin (SOM)
19. 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'
dBi
rule of 10s and 3s
receiver
watt
20. 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
system operating margin (SOM)
isotropic radiator
antenna
dBi
21. A level of desired signal above What is required
point source
dBm
fade margin
intentional radiator (IR)
22. A device that intentionally generates and emits radio frequency energy by radiation or induction
intentional radiator (IR)
receiver
transmitter
isotropic radiator
23. A unit of power equal to 1/1000 of a watt
received signal strength indicator (RSSI)
dBd
milliwatt
link budget