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wirelessQ1

Frage 1 von 27

1

How many antennas are used with diversity?

Wähle eine der folgenden:

  • FOUR

  • ONE

  • THREE

  • TWO

Erklärung

Frage 2 von 27

1

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

Wähle eine der folgenden:

  • dBi

  • dBm

  • dBd

  • dB

Erklärung

Frage 3 von 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.)

Wähle eine oder mehr der folgenden:

  • SNR

  • dBm

  • RSSI

  • EIRP

Erklärung

Frage 4 von 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)

Wähle eine oder mehr der folgenden:

  • Null SSID

  • Metal file cabinets

  • Cordless phones

  • Antenna type or direction

  • Mismatched SSID

Erklärung

Frage 5 von 27

1

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

Wähle eine der folgenden:

  • Airplane

  • C-Plane

  • E-Plane

  • H-Plane

Erklärung

Frage 6 von 27

1

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

Wähle eine der folgenden:

  • Absorption

  • Scattering

  • Reflection

  • Refraction

Erklärung

Frage 7 von 27

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 8 von 27

1

What does amplitude measure?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 9 von 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.)

Wähle eine oder mehr der folgenden:

  • User Density

  • Brick Wall

  • Indoor temperature

  • Dry wall

Erklärung

Frage 10 von 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?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 11 von 27

1

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

Wähle eine oder mehr der folgenden:

  • They work regardless of the frequency

  • Attenuation decreases as frequency increases

  • They add and loss to the signal

  • They cause impedance on the signal

Erklärung

Frage 12 von 27

1

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

Wähle eine der folgenden:

  • Use more frequency

  • Utilize lower band frequencies

  • Utlize upper band frequencies

  • Use more complex encoding

Erklärung

Frage 13 von 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?

Wähle eine der folgenden:

  • WWAN

  • WLAN

  • WMAN

  • WPAN

Erklärung

Frage 14 von 27

1

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

Wähle eine der folgenden:

  • Omnidirectional

  • Semidirectional

  • Yagi

  • Parabolic Dish

Erklärung

Frage 15 von 27

1

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

Wähle eine der folgenden:

  • Amplifier

  • Lightning arrestor

  • Fiber-patch

  • Attenuator

Erklärung

Frage 16 von 27

1

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

Wähle eine der folgenden:

  • 10 to 15 percent

  • 40 to 80 percent

  • 50 percent

  • 100 percent

Erklärung

Frage 17 von 27

1

Which of the following statements is correct?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 18 von 27

1

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

Wähle eine der folgenden:

  • 1 Hz

  • 1 MHz

  • 1000000 Mb

  • 1 joule

Erklärung

Frage 19 von 27

1

EIRP is calculated using which of the following formulas?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 20 von 27

1

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

Wähle eine der folgenden:

  • –75 dBm

  • –90 dBm

  • –60 dBm

  • –15 dBm

Erklärung

Frage 21 von 27

1

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

Wähle eine oder mehr der folgenden:

  • Horizontal

  • Vertical

  • Nautical

  • Circular

Erklärung

Frage 22 von 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.

Wähle eine der folgenden:

  • In phase, intersymbol interference

  • In phase, cancellation

  • 180 degrees, out of phase, cancellation

  • 180 degrees out of phase, amplification

  • Out of phase, scattering

Erklärung

Frage 23 von 27

1

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

Wähle eine der folgenden:

  • 60%

  • 40%

  • 70%

  • 20%

Erklärung

Frage 24 von 27

1

Which of the following statements is true regarding bridged networks?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 25 von 27

1

Choose two the main categories of antennas?

Wähle eine oder mehr der folgenden:

  • Omnidirectional

  • Yagi

  • Unidirectional

  • Directional

Erklärung

Frage 26 von 27

1

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

Wähle eine der folgenden:

  • BSS

  • Solitary Service Set

  • Single-Mode Set (SMS)

  • Independent Basic Service Set (IBSS)

Erklärung

Frage 27 von 27

1

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

Wähle eine oder mehr der folgenden:

  • Next to the electrical room

  • In the hallways

  • In the lobby

  • Near medical imaging devices

  • In front of the elevators doors

  • Inside offices

Erklärung

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