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96.
Amplifiers provide an increase in signal strength by using ________ gain.
- A.Active
- B.Passive
- C.Positive
- D.Maximum
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Active gain requires an external power source to provide an increase in signal strength. An amplifi er is an example of a device that uses active gain. Antennas provide an increase in strength by using passive gain. |
97.
Highly directional antennas are typically used for ___________ connectivity.
- A.Short-range
- B.Omnidirectional
- C.Long-range
- D.Dipole
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Highly directional antennas are typically used for long-range point-to-point connectivity such as bridge links. Omnidirectional antennas are used as part of an access point system or to provide point-to-multipoint links. |
98.
You are a network engineer. While moving a handheld wireless LAN device, you notice
that the signal strength increases when the device is moved from a horizontal to a vertical
position. This is because the is changing.
- A.Polarization
- B.Wavelength
- C.Frequency
- D.Diffusion
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Changing the orientation of a device or antenna will change the polarization and affect the received signal strength. The signal strength may either increase or decrease depending on how the polarization is changed from the original position. Wavelength, frequency, and phase are characteristics of radio frequency. |
99.
RF line of sight is required for what type of IEEE 802.11 WLAN installation? (Choose two.)
- A.Point-to-point
- B.Scattered
- C.Point-to-multipoint
- D.Reflected
- E.Refracted
- Answer & Explanation
- Report
Answer : [A, C]
Explanation :
Explanation :
| Point-to-point and point-to-multipoint both require RF line of sight to be able to effectively communicate. Scattering, refl ection, and refraction are all behaviors of radio frequency. |
100.
Which can cause a loss of signal strength? (Choose two.)
- A.Antenna
- B.Amplifier
- C.Cable
- D.Connector
- E.Transmitter
- Answer & Explanation
- Report
Answer : [C, D]
Explanation :
Explanation :
| Cables and connectors can both result in a loss of signal strength. Antennas and amplifi ers will add gain or increase signal strength. A transmitter outputs an absolute amount of power. |
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