Cyber-Security: Wireless 2
This flashcard set explores key principles of radio frequency (RF) signals, including the interrelation of wave properties, the effects of fading on signal strength, and environmental factors that cause signal refraction.
Which three properties are interrelated?
Frequency, wavelength and the speed of light
Key Terms
Which three properties are interrelated?
Frequency, wavelength and the speed of light
Which of the following statements are true?
When downfade occurs, the final received signla willl never be stronger then the original transmitted signal
When up...
Which of the following can cause refraction of a RF signal traveling through it?
Smog
Shift in the air temeperature
Change in air pressure
Humidity
When an RF signal bends around an object, this propagation behavior is known as what?
Diffraction
Using knowledge of RF characteristics and behaviors, which two options should a WLAN engineer be most concerned about during an indoor site survery?
Wood-lath plaster walls
Brick walls
What is an example of a frequency domain tool that should be used by an RF engineer?
Spectrum analyzer
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Term | Definition |
---|---|
Which three properties are interrelated? | Frequency, wavelength and the speed of light |
Which of the following statements are true? | When downfade occurs, the final received signla willl never be stronger then the original transmitted signal When upfade occurs, the final received signal will never be stronger than the orignial transmitted signal |
Which of the following can cause refraction of a RF signal traveling through it? | Smog |
When an RF signal bends around an object, this propagation behavior is known as what? | Diffraction |
Using knowledge of RF characteristics and behaviors, which two options should a WLAN engineer be most concerned about during an indoor site survery? | Wood-lath plaster walls Brick walls |
What is an example of a frequency domain tool that should be used by an RF engineer? | Spectrum analyzer |
What is the best example of a time domain tool that could be used by an RF engineer? | Oscilloscope |
Which behavior can be described as an RF signal encountering a chain link fence, causing the signal to bounce into multiple directionss | Scatter |
Which of the following statements are true about amplification | RF amplifiers require an outside power source Antennas are passive gain amplifiers that focus the energy of a signal |
Which of these propagation behaviours can result in multipath | Scattering |
What are some reults of multipath interference | Excessive retransmission upfade |
Which 802.11 radio technologies are most impacted by the destructive effects of multipath? |
|
Which of the following statements are true about free space path loss? | RF signal will attenuate as they travel, despite the lacak attenuation caused by obstructions Path loss occurs at logarithmic rate |
What is the frequency of an RF signal that cycles 2.4 million time per second? | 2.4 MHz |
What are some objects or materials that are common causes of reflection? | Metal |
Which RF behavior best describes a signal striking a medium and bending in a different direction? | Refraction |
What term is used to describe the time differential between a primary signal and a reflected signal arriving at a receiver? | Delay spread |
When the multiple RF signals arrive at a receive at the same time are ____ with the primary wave, the result can be ____ of the primary signal | 180 degrees out of phase, cancellation |
A standard measurement of frequency is called what? | Hertz |
What terms best defines the linear distance traveled in one positive-to-negative-to-positive osicallatoin of an electromagnetic signal? | Wavelength |