4577915
Descripción
Test por michael.0lsn, actualizado hace más de 1 año
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Creado por michael.0lsn
hace casi 9 años
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Pregunta 1
Pregunta
How many antennas are used with diversity?
Respuesta
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FOUR
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ONE
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THREE
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TWO
Pregunta 2
Pregunta
Which of the following measurements is referenced against an antenna that radiates perfectly in all directions?
Respuesta
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dBi
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dBm
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dBd
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dB
Pregunta 3
Pregunta
Bob works as a network administrator for ABC Auto Inc. The company deploys a wireless LAN network but there is some problem due to the interference of signals. Which of the following tools should you use to determine signal strength, noise level. (Choose two.)
Respuesta
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SNR
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dBm
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RSSI
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EIRP
Pregunta 4
Pregunta
A single 802.11 access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem? (Choose three)
Respuesta
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Null SSID
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Metal file cabinets
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Cordless phones
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Antenna type or direction
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Mismatched SSID
Pregunta 5
Pregunta
To display the coverage from the top of the antenna, what plane is represented?
Respuesta
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Airplane
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C-Plane
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E-Plane
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H-Plane
Pregunta 6
Pregunta
Metal desks, glass, light fixtures, and computer screens can contribute to which influence on wireless transmissions?
Respuesta
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Absorption
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Scattering
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Reflection
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Refraction
Pregunta 7
Pregunta
Which of the following statements is true about free space path loss?
Respuesta
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RF signals will attenuate as they travel because of obstructions
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Path loss occurs at a constant linear rate
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Path loss primarily occurs because of cancellation
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RF signals will attenuate as they travel despite the lack of attenuation caused by obstructions.
Pregunta 8
Pregunta
What does amplitude measure?
Respuesta
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Distance from high crest to high crest horizontally in a waveform
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Distance between two access points
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Height of wave from lowest crest to highest crest
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Distance from low crest to midspan in a waveform
Pregunta 9
Pregunta
Using knowledge of RF characteristics and behaviors, which two options should a WLAN engineer be most concerned about during an indoor site survey? (Choose two.)
Respuesta
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User Density
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Brick Wall
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Indoor temperature
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Dry wall
Pregunta 10
Pregunta
Bob works as a network administrator for the superawesomedelvery.com at Calgary. Bob was asked to implement WLAN in an office area. He deployed APs with internal antennas and mounted them on the wall. After Bob deployed APs, neighboring companies; specially, ones are a floor above and below have been complaining about interferences. What is likely caused the interferences?
Respuesta
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Incorrect type of APs are used
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Incorrect installation- APs should be mounted on the celling
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Incorrect antennas used –should have used external antennas
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Incorrrect type of cables and connectors are used
Pregunta 11
Pregunta
Which of the following are true about cables? (Choose two)
Respuesta
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They work regardless of the frequency
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Attenuation decreases as frequency increases
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They add and loss to the signal
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They cause impedance on the signal
Pregunta 12
Pregunta
Which of the following methods can be used to send more data across the airwaves?
Respuesta
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Use more frequency
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Utilize lower band frequencies
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Utlize upper band frequencies
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Use more complex encoding
Pregunta 13
Pregunta
If you have a wireless network that connects buildings for very long distances, and covers a large geographic area, what is this network called?
Respuesta
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WWAN
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WLAN
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WMAN
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WPAN
Pregunta 14
Pregunta
Which type of antenna produces the least amount of passive gain?
Respuesta
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Omnidirectional
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Semidirectional
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Yagi
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Parabolic Dish
Pregunta 15
Pregunta
To lower the amount of energy being sent to the antenna, which of the following device could be used?
Respuesta
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Amplifier
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Lightning arrestor
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Fiber-patch
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Attenuator
Pregunta 16
Pregunta
How much overlap is needed when an AP is a wireless repeater mode?
Respuesta
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10 to 15 percent
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40 to 80 percent
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50 percent
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100 percent
Pregunta 17
Pregunta
Which of the following statements is correct?
Respuesta
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A lower-frequency signal travels less than a higher-frequency signal and attenuates faster.
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A lower-frequency signal travels farther than a higher-frequency signal but attenuates faster
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A higher-frequency signal travels less than a lower-frequency signal and attenuates faster
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A higher-frequency signal travels farther than a lower-frequency signal but attenuates faster
Pregunta 18
Pregunta
Which of the following best describes a frequency that is seen 1 million times per second?
Respuesta
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1 Hz
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1 MHz
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1000000 Mb
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1 joule
Pregunta 19
Pregunta
EIRP is calculated using which of the following formulas?
Respuesta
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EIRP = cable gain – cable loss + antenna gain
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EIRP = interference – cable loss + antenna gain
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EIRP = transmitter power – cable loss + antenna gain
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EIRP = transmitter loss + cable loss + antenna gain
Pregunta 20
Pregunta
Select one that represents the strongest signal as measured in RSSI.
Respuesta
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–75 dBm
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–90 dBm
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–60 dBm
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–15 dBm
Pregunta 21
Pregunta
Which of the followings are types of polarization? (Choose all that apply.)
Respuesta
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Horizontal
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Vertical
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Nautical
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Circular
Pregunta 22
Pregunta
When the multiple RF signals arrive at a receiver at the same time and they are ____________ with the primary wave, the result can be _______________of the primary signal.
Respuesta
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In phase, intersymbol interference
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In phase, cancellation
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180 degrees, out of phase, cancellation
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180 degrees out of phase, amplification
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Out of phase, scattering
Pregunta 23
Pregunta
What percentage of the Fresnel Zone must be clear of obstructions for a signal to be received properly?
Respuesta
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60%
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40%
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70%
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20%
Pregunta 24
Pregunta
Which of the following statements is true regarding bridged networks?
Respuesta
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Root bridges can only communicate to APs.
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Nonroot bridges can only communicate to root bridges.
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Root bridges can only communicate to other root bridges
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Nonroot bridges can only communicate to nonroot bridges
Pregunta 25
Pregunta
Choose two the main categories of antennas?
Respuesta
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Omnidirectional
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Yagi
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Unidirectional
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Directional
Pregunta 26
Pregunta
If an AP is not used in a wireless network, this is called which of the following?
Respuesta
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BSS
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Solitary Service Set
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Single-Mode Set (SMS)
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Independent Basic Service Set (IBSS)
Pregunta 27
Pregunta
You are designing a wireless network in a medical facility, which three areas are bad location to install a wireless access point?
Respuesta
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Next to the electrical room
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In the hallways
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In the lobby
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Near medical imaging devices
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In front of the elevators doors
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Inside offices
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