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wirelessQ1

Pregunta 1 de 27

1

How many antennas are used with diversity?

Selecciona una de las siguientes respuestas posibles:

  • FOUR

  • ONE

  • THREE

  • TWO

Explicación

Pregunta 2 de 27

1

Which of the following measurements is referenced against an antenna that radiates perfectly in all directions?

Selecciona una de las siguientes respuestas posibles:

  • dBi

  • dBm

  • dBd

  • dB

Explicación

Pregunta 3 de 27

1

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.)

Selecciona una o más de las siguientes respuestas posibles:

  • SNR

  • dBm

  • RSSI

  • EIRP

Explicación

Pregunta 4 de 27

1

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)

Selecciona una o más de las siguientes respuestas posibles:

  • Null SSID

  • Metal file cabinets

  • Cordless phones

  • Antenna type or direction

  • Mismatched SSID

Explicación

Pregunta 5 de 27

1

To display the coverage from the top of the antenna, what plane is represented?

Selecciona una de las siguientes respuestas posibles:

  • Airplane

  • C-Plane

  • E-Plane

  • H-Plane

Explicación

Pregunta 6 de 27

1

Metal desks, glass, light fixtures, and computer screens can contribute to which influence on wireless transmissions?

Selecciona una de las siguientes respuestas posibles:

  • Absorption

  • Scattering

  • Reflection

  • Refraction

Explicación

Pregunta 7 de 27

1

Which of the following statements is true about free space path loss?

Selecciona una de las siguientes respuestas posibles:

  • RF signals will attenuate as they travel because of obstructions

  • Path loss occurs at a constant linear rate

  • Path loss primarily occurs because of cancellation

  • RF signals will attenuate as they travel despite the lack of attenuation caused by obstructions.

Explicación

Pregunta 8 de 27

1

What does amplitude measure?

Selecciona una de las siguientes respuestas posibles:

  • Distance from high crest to high crest horizontally in a waveform

  • Distance between two access points

  • Height of wave from lowest crest to highest crest

  • Distance from low crest to midspan in a waveform

Explicación

Pregunta 9 de 27

1

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.)

Selecciona una o más de las siguientes respuestas posibles:

  • User Density

  • Brick Wall

  • Indoor temperature

  • Dry wall

Explicación

Pregunta 10 de 27

1

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?

Selecciona una de las siguientes respuestas posibles:

  • Incorrect type of APs are used

  • Incorrect installation- APs should be mounted on the celling

  • Incorrect antennas used –should have used external antennas

  • Incorrrect type of cables and connectors are used

Explicación

Pregunta 11 de 27

1

Which of the following are true about cables? (Choose two)

Selecciona una o más de las siguientes respuestas posibles:

  • They work regardless of the frequency

  • Attenuation decreases as frequency increases

  • They add and loss to the signal

  • They cause impedance on the signal

Explicación

Pregunta 12 de 27

1

Which of the following methods can be used to send more data across the airwaves?

Selecciona una de las siguientes respuestas posibles:

  • Use more frequency

  • Utilize lower band frequencies

  • Utlize upper band frequencies

  • Use more complex encoding

Explicación

Pregunta 13 de 27

1

If you have a wireless network that connects buildings for very long distances, and covers a large geographic area, what is this network called?

Selecciona una de las siguientes respuestas posibles:

  • WWAN

  • WLAN

  • WMAN

  • WPAN

Explicación

Pregunta 14 de 27

1

Which type of antenna produces the least amount of passive gain?

Selecciona una de las siguientes respuestas posibles:

  • Omnidirectional

  • Semidirectional

  • Yagi

  • Parabolic Dish

Explicación

Pregunta 15 de 27

1

To lower the amount of energy being sent to the antenna, which of the following device could be used?

Selecciona una de las siguientes respuestas posibles:

  • Amplifier

  • Lightning arrestor

  • Fiber-patch

  • Attenuator

Explicación

Pregunta 16 de 27

1

How much overlap is needed when an AP is a wireless repeater mode?

Selecciona una de las siguientes respuestas posibles:

  • 10 to 15 percent

  • 40 to 80 percent

  • 50 percent

  • 100 percent

Explicación

Pregunta 17 de 27

1

Which of the following statements is correct?

Selecciona una de las siguientes respuestas posibles:

  • A lower-frequency signal travels less than a higher-frequency signal and attenuates faster.

  • A lower-frequency signal travels farther than a higher-frequency signal but attenuates faster

  • A higher-frequency signal travels less than a lower-frequency signal and attenuates faster

  • A higher-frequency signal travels farther than a lower-frequency signal but attenuates faster

Explicación

Pregunta 18 de 27

1

Which of the following best describes a frequency that is seen 1 million times per second?

Selecciona una de las siguientes respuestas posibles:

  • 1 Hz

  • 1 MHz

  • 1000000 Mb

  • 1 joule

Explicación

Pregunta 19 de 27

1

EIRP is calculated using which of the following formulas?

Selecciona una de las siguientes respuestas posibles:

  • EIRP = cable gain – cable loss + antenna gain

  • EIRP = interference – cable loss + antenna gain

  • EIRP = transmitter power – cable loss + antenna gain

  • EIRP = transmitter loss + cable loss + antenna gain

Explicación

Pregunta 20 de 27

1

Select one that represents the strongest signal as measured in RSSI.

Selecciona una de las siguientes respuestas posibles:

  • –75 dBm

  • –90 dBm

  • –60 dBm

  • –15 dBm

Explicación

Pregunta 21 de 27

1

Which of the followings are types of polarization? (Choose all that apply.)

Selecciona una o más de las siguientes respuestas posibles:

  • Horizontal

  • Vertical

  • Nautical

  • Circular

Explicación

Pregunta 22 de 27

1

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.

Selecciona una de las siguientes respuestas posibles:

  • In phase, intersymbol interference

  • In phase, cancellation

  • 180 degrees, out of phase, cancellation

  • 180 degrees out of phase, amplification

  • Out of phase, scattering

Explicación

Pregunta 23 de 27

1

What percentage of the Fresnel Zone must be clear of obstructions for a signal to be received properly?

Selecciona una de las siguientes respuestas posibles:

  • 60%

  • 40%

  • 70%

  • 20%

Explicación

Pregunta 24 de 27

1

Which of the following statements is true regarding bridged networks?

Selecciona una de las siguientes respuestas posibles:

  • Root bridges can only communicate to APs.

  • Nonroot bridges can only communicate to root bridges.

  • Root bridges can only communicate to other root bridges

  • Nonroot bridges can only communicate to nonroot bridges

Explicación

Pregunta 25 de 27

1

Choose two the main categories of antennas?

Selecciona una o más de las siguientes respuestas posibles:

  • Omnidirectional

  • Yagi

  • Unidirectional

  • Directional

Explicación

Pregunta 26 de 27

1

If an AP is not used in a wireless network, this is called which of the following?

Selecciona una de las siguientes respuestas posibles:

  • BSS

  • Solitary Service Set

  • Single-Mode Set (SMS)

  • Independent Basic Service Set (IBSS)

Explicación

Pregunta 27 de 27

1

You are designing a wireless network in a medical facility, which three areas are bad location to install a wireless access point?

Selecciona una o más de las siguientes respuestas posibles:

  • Next to the electrical room

  • In the hallways

  • In the lobby

  • Near medical imaging devices

  • In front of the elevators doors

  • Inside offices

Explicación