Quiz
wirelessQ1
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Fragen in diesem Quiz (27)
1How many antennas are used with diversity?
- AFOUR
- BONE
- CTHREE
- DTWO
2Which of the following measurements is referenced against an antenna that radiates perfectly in all directions?
- AdBi
- BdBm
- CdBd
- DdB
3Bob 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.)
- ASNR
- BdBm
- CRSSI
- DEIRP
4A 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)
- ANull SSID
- BMetal file cabinets
- CCordless phones
- DAntenna type or direction
- EMismatched SSID
5To display the coverage from the top of the antenna, what plane is represented?
- AAirplane
- BC-Plane
- CE-Plane
- DH-Plane
6Metal desks, glass, light fixtures, and computer screens can contribute to which influence on wireless transmissions?
- AAbsorption
- BScattering
- CReflection
- DRefraction
7Which of the following statements is true about free space path loss?
- ARF signals will attenuate as they travel because of obstructions
- BPath loss occurs at a constant linear rate
- CPath loss primarily occurs because of cancellation
- DRF signals will attenuate as they travel despite the lack of attenuation caused by obstructions.
8What does amplitude measure?
- ADistance from high crest to high crest horizontally in a waveform
- BDistance between two access points
- CHeight of wave from lowest crest to highest crest
- DDistance from low crest to midspan in a waveform
9Using knowledge of RF characteristics and behaviors, which two options should a WLAN engineer be most concerned about during an indoor site survey? (Choose two.)
- AUser Density
- BBrick Wall
- CIndoor temperature
- DDry wall
10Bob 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?
- AIncorrect type of APs are used
- BIncorrect installation- APs should be mounted on the celling
- CIncorrect antennas used –should have used external antennas
- DIncorrrect type of cables and connectors are used
11Which of the following are true about cables? (Choose two)
- AThey work regardless of the frequency
- BAttenuation decreases as frequency increases
- CThey add and loss to the signal
- DThey cause impedance on the signal
12Which of the following methods can be used to send more data across the airwaves?
- AUse more frequency
- BUtilize lower band frequencies
- CUtlize upper band frequencies
- DUse more complex encoding
13If you have a wireless network that connects buildings for very long distances, and covers a large geographic area, what is this network called?
- AWWAN
- BWLAN
- CWMAN
- DWPAN
14Which type of antenna produces the least amount of passive gain?
- AOmnidirectional
- BSemidirectional
- CYagi
- DParabolic Dish
15To lower the amount of energy being sent to the antenna, which of the following device could be used?
- AAmplifier
- BLightning arrestor
- CFiber-patch
- DAttenuator
16How much overlap is needed when an AP is a wireless repeater mode?
- A10 to 15 percent
- B40 to 80 percent
- C50 percent
- D100 percent
17Which of the following statements is correct?
- AA lower-frequency signal travels less than a higher-frequency signal and attenuates faster.
- BA lower-frequency signal travels farther than a higher-frequency signal but attenuates faster
- CA higher-frequency signal travels less than a lower-frequency signal and attenuates faster
- DA higher-frequency signal travels farther than a lower-frequency signal but attenuates faster
18Which of the following best describes a frequency that is seen 1 million times per second?
- A1 Hz
- B1 MHz
- C1000000 Mb
- D1 joule
19EIRP is calculated using which of the following formulas?
- AEIRP = cable gain – cable loss + antenna gain
- BEIRP = interference – cable loss + antenna gain
- CEIRP = transmitter power – cable loss + antenna gain
- DEIRP = transmitter loss + cable loss + antenna gain
20Select one that represents the strongest signal as measured in RSSI.
- A–75 dBm
- B–90 dBm
- C–60 dBm
- D–15 dBm
21Which of the followings are types of polarization? (Choose all that apply.)
- AHorizontal
- BVertical
- CNautical
- DCircular
22When 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.
- AIn phase, intersymbol interference
- BIn phase, cancellation
- C180 degrees, out of phase, cancellation
- D180 degrees out of phase, amplification
- EOut of phase, scattering
23What percentage of the Fresnel Zone must be clear of obstructions for a signal to be received properly?
- A60%
- B40%
- C70%
- D20%
24Which of the following statements is true regarding bridged networks?
- ARoot bridges can only communicate to APs.
- BNonroot bridges can only communicate to root bridges.
- CRoot bridges can only communicate to other root bridges
- DNonroot bridges can only communicate to nonroot bridges
25Choose two the main categories of antennas?
- AOmnidirectional
- BYagi
- CUnidirectional
- DDirectional
26If an AP is not used in a wireless network, this is called which of the following?
- ABSS
- BSolitary Service Set
- CSingle-Mode Set (SMS)
- DIndependent Basic Service Set (IBSS)
27You are designing a wireless network in a medical facility, which three areas are bad location to install a wireless access point?
- ANext to the electrical room
- BIn the hallways
- CIn the lobby
- DNear medical imaging devices
- EIn front of the elevators doors
- FInside offices
Informationen
- Beschreibung
- notes.
- Autor
- michael.0lsn
- Sprache
- English
- Aufrufe
- 236
- Schlagwörter
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