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wirelessQ1

Questão 1 de 27

1

How many antennas are used with diversity?

Selecione uma das seguintes:

  • FOUR

  • ONE

  • THREE

  • TWO

Explicação

Questão 2 de 27

1

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

Selecione uma das seguintes:

  • dBi

  • dBm

  • dBd

  • dB

Explicação

Questão 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.)

Selecione uma ou mais das seguintes:

  • SNR

  • dBm

  • RSSI

  • EIRP

Explicação

Questão 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)

Selecione uma ou mais das seguintes:

  • Null SSID

  • Metal file cabinets

  • Cordless phones

  • Antenna type or direction

  • Mismatched SSID

Explicação

Questão 5 de 27

1

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

Selecione uma das seguintes:

  • Airplane

  • C-Plane

  • E-Plane

  • H-Plane

Explicação

Questão 6 de 27

1

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

Selecione uma das seguintes:

  • Absorption

  • Scattering

  • Reflection

  • Refraction

Explicação

Questão 7 de 27

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 8 de 27

1

What does amplitude measure?

Selecione uma das seguintes:

  • 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

Explicação

Questão 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.)

Selecione uma ou mais das seguintes:

  • User Density

  • Brick Wall

  • Indoor temperature

  • Dry wall

Explicação

Questão 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?

Selecione uma das seguintes:

  • 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

Explicação

Questão 11 de 27

1

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

Selecione uma ou mais das seguintes:

  • They work regardless of the frequency

  • Attenuation decreases as frequency increases

  • They add and loss to the signal

  • They cause impedance on the signal

Explicação

Questão 12 de 27

1

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

Selecione uma das seguintes:

  • Use more frequency

  • Utilize lower band frequencies

  • Utlize upper band frequencies

  • Use more complex encoding

Explicação

Questão 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?

Selecione uma das seguintes:

  • WWAN

  • WLAN

  • WMAN

  • WPAN

Explicação

Questão 14 de 27

1

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

Selecione uma das seguintes:

  • Omnidirectional

  • Semidirectional

  • Yagi

  • Parabolic Dish

Explicação

Questão 15 de 27

1

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

Selecione uma das seguintes:

  • Amplifier

  • Lightning arrestor

  • Fiber-patch

  • Attenuator

Explicação

Questão 16 de 27

1

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

Selecione uma das seguintes:

  • 10 to 15 percent

  • 40 to 80 percent

  • 50 percent

  • 100 percent

Explicação

Questão 17 de 27

1

Which of the following statements is correct?

Selecione uma das seguintes:

  • 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

Explicação

Questão 18 de 27

1

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

Selecione uma das seguintes:

  • 1 Hz

  • 1 MHz

  • 1000000 Mb

  • 1 joule

Explicação

Questão 19 de 27

1

EIRP is calculated using which of the following formulas?

Selecione uma das seguintes:

  • 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

Explicação

Questão 20 de 27

1

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

Selecione uma das seguintes:

  • –75 dBm

  • –90 dBm

  • –60 dBm

  • –15 dBm

Explicação

Questão 21 de 27

1

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

Selecione uma ou mais das seguintes:

  • Horizontal

  • Vertical

  • Nautical

  • Circular

Explicação

Questão 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.

Selecione uma das seguintes:

  • In phase, intersymbol interference

  • In phase, cancellation

  • 180 degrees, out of phase, cancellation

  • 180 degrees out of phase, amplification

  • Out of phase, scattering

Explicação

Questão 23 de 27

1

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

Selecione uma das seguintes:

  • 60%

  • 40%

  • 70%

  • 20%

Explicação

Questão 24 de 27

1

Which of the following statements is true regarding bridged networks?

Selecione uma das seguintes:

  • 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

Explicação

Questão 25 de 27

1

Choose two the main categories of antennas?

Selecione uma ou mais das seguintes:

  • Omnidirectional

  • Yagi

  • Unidirectional

  • Directional

Explicação

Questão 26 de 27

1

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

Selecione uma das seguintes:

  • BSS

  • Solitary Service Set

  • Single-Mode Set (SMS)

  • Independent Basic Service Set (IBSS)

Explicação

Questão 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?

Selecione uma ou mais das seguintes:

  • Next to the electrical room

  • In the hallways

  • In the lobby

  • Near medical imaging devices

  • In front of the elevators doors

  • Inside offices

Explicação

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