michael.0lsn
Quiz by , created more than 1 year ago

notes.

80
1
1
michael.0lsn
Created by michael.0lsn over 8 years ago
Close

wirelessQ1

Question 1 of 27

1

How many antennas are used with diversity?

Select one of the following:

  • FOUR

  • ONE

  • THREE

  • TWO

Explanation

Question 2 of 27

1

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

Select one of the following:

  • dBi

  • dBm

  • dBd

  • dB

Explanation

Question 3 of 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.)

Select one or more of the following:

  • SNR

  • dBm

  • RSSI

  • EIRP

Explanation

Question 4 of 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)

Select one or more of the following:

  • Null SSID

  • Metal file cabinets

  • Cordless phones

  • Antenna type or direction

  • Mismatched SSID

Explanation

Question 5 of 27

1

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

Select one of the following:

  • Airplane

  • C-Plane

  • E-Plane

  • H-Plane

Explanation

Question 6 of 27

1

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

Select one of the following:

  • Absorption

  • Scattering

  • Reflection

  • Refraction

Explanation

Question 7 of 27

1

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

Select one of the following:

  • 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.

Explanation

Question 8 of 27

1

What does amplitude measure?

Select one of the following:

  • 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

Explanation

Question 9 of 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.)

Select one or more of the following:

  • User Density

  • Brick Wall

  • Indoor temperature

  • Dry wall

Explanation

Question 10 of 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?

Select one of the following:

  • 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

Explanation

Question 11 of 27

1

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

Select one or more of the following:

  • They work regardless of the frequency

  • Attenuation decreases as frequency increases

  • They add and loss to the signal

  • They cause impedance on the signal

Explanation

Question 12 of 27

1

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

Select one of the following:

  • Use more frequency

  • Utilize lower band frequencies

  • Utlize upper band frequencies

  • Use more complex encoding

Explanation

Question 13 of 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?

Select one of the following:

  • WWAN

  • WLAN

  • WMAN

  • WPAN

Explanation

Question 14 of 27

1

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

Select one of the following:

  • Omnidirectional

  • Semidirectional

  • Yagi

  • Parabolic Dish

Explanation

Question 15 of 27

1

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

Select one of the following:

  • Amplifier

  • Lightning arrestor

  • Fiber-patch

  • Attenuator

Explanation

Question 16 of 27

1

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

Select one of the following:

  • 10 to 15 percent

  • 40 to 80 percent

  • 50 percent

  • 100 percent

Explanation

Question 17 of 27

1

Which of the following statements is correct?

Select one of the following:

  • 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

Explanation

Question 18 of 27

1

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

Select one of the following:

  • 1 Hz

  • 1 MHz

  • 1000000 Mb

  • 1 joule

Explanation

Question 19 of 27

1

EIRP is calculated using which of the following formulas?

Select one of the following:

  • 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

Explanation

Question 20 of 27

1

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

Select one of the following:

  • –75 dBm

  • –90 dBm

  • –60 dBm

  • –15 dBm

Explanation

Question 21 of 27

1

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

Select one or more of the following:

  • Horizontal

  • Vertical

  • Nautical

  • Circular

Explanation

Question 22 of 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.

Select one of the following:

  • In phase, intersymbol interference

  • In phase, cancellation

  • 180 degrees, out of phase, cancellation

  • 180 degrees out of phase, amplification

  • Out of phase, scattering

Explanation

Question 23 of 27

1

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

Select one of the following:

  • 60%

  • 40%

  • 70%

  • 20%

Explanation

Question 24 of 27

1

Which of the following statements is true regarding bridged networks?

Select one of the following:

  • 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

Explanation

Question 25 of 27

1

Choose two the main categories of antennas?

Select one or more of the following:

  • Omnidirectional

  • Yagi

  • Unidirectional

  • Directional

Explanation

Question 26 of 27

1

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

Select one of the following:

  • BSS

  • Solitary Service Set

  • Single-Mode Set (SMS)

  • Independent Basic Service Set (IBSS)

Explanation

Question 27 of 27

1

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

Select one or more of the following:

  • Next to the electrical room

  • In the hallways

  • In the lobby

  • Near medical imaging devices

  • In front of the elevators doors

  • Inside offices

Explanation

Previous
Check answer
Next