Information Technology /Cyber-Security: Wireless 2

Cyber-Security: Wireless 2

Information Technology20 CardsCreated about 2 months ago

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

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Key Terms

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 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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TermDefinition

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
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

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
Reflection
Refraction
Diffraction

What are some reults of multipath interference

Excessive retransmission

upfade

Which 802.11 radio technologies are most impacted by the destructive effects of multipath?

  1. 11b

  2. 11a

  3. 11g

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
Lake
Asphalt road

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