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CWNA Radio Frequency Components Measurements And Mathematics

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. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt






2. 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'






3. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)






4. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver






5. Provides approximate values when performing RF math calculations. 4 rules






6. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example






7. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example






8. A point source that radiates signal equally in all directions. e.g. sun






9. 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






10. A point that radiates signal equally in all directions. e.g. sun






11. The highest RF signal strength that is transmitted from a particular antenna






12. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power






13. 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






14. A device that intentionally generates and emits radio frequency energy by radiation or induction






15. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver






16. 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'






17. The amount of signal a wireless station must receive in order to distinguish between data and noise






18. A level of desired signal above What is required






19. This law states that the change in power is equal to 1 divided by the square of the change in distance


20. 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






21. A unit of power equal to 1/1000 of a watt






22. 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






23. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication