PW0-104 Wireless LAN Administration Certified Practice Exam Set 1

In a long-distance RF link, what statement about Fade Margin is true?


Options are :

  • Fade Margin and Jamming Margin are synonymous, interchangeable terms.
  • The Fade Margin of a long-distance RF link does not account for antenna gain.
  • Fade Margin is rarely taken into account on a long-distance RF link
  • Fade Margin is an amount of signal strength in addition to the Link Budget

Answer : Fade Margin is an amount of signal strength in addition to the Link Budget

CWNA-106 Certified Wireless Network Administrator Exam Set 5

Given: XYZ Company is constructing a building-to-building ERP-OFDM bridge link using patch antennas. The buildings are 4 blocks apart in the middle of a large city. XYZ Company is using the rooftop of each building for antenna placement. There are several buildings closely spaced between the two locations, but there is a narrow visual line-ofsight. The link does not work as XYZ Company had hoped.What would you do to rectify this problem at the lowest possible cost?


Options are :

  • Change the antennas to high gain parabolic dish or grid antennas with a narrow beamwidth. This will sufficiently shrink the Fresnel Zone to an area where other buildings are not impeding.
  • Decrease the output power to the minimum allowed by the link budget calculation. This will minimize the size of the Fresnel Zone and increase the quality of the wireless link.
  • On top of each building, place a mast or tower that is tall enough to completely clear the Fresnel Zone of obstructions between the two antennas.
  • Use a vertically-polarized antenna on one building and a horizontally-polarized antenna on the other to decrease the size of the Fresnel Zone. Cross-polarization will shrink the Fresnel Zone size while allowing the output power to remain the same.

Answer : On top of each building, place a mast or tower that is tall enough to completely clear the Fresnel Zone of obstructions between the two antennas.

What term describes the effect of increasing the intensity of an RF wave when the RF antenna lobe is focused in a desired direction?


Options are :

  • Beam Compression
  • Active Amplification
  • Passive Gain
  • Directional Extension

Answer : Passive Gain

The IEEE 802.11-2007 standard requires ERP-OFDM capable devices to be backwards compatible with devices using which other 802.11 physical layer specifications (PHYs)?


Options are :

  • ERP-PBCC
  • HR/DSSS
  • DSSS
  • FHSS

Answer : HR/DSSS DSSS

PW0-105 Certified Wireless Network Administrator CWNA Exam Set 3

What antenna characteristic decreases as the gain of the antenna is increased?


Options are :

  • Polarization radius
  • Dissipated heat
  • Range
  • Beamwidth

Answer : Beamwidth

What factors are required to establish a high quality 2.4 GHz point-to-point RF link at a distance of 3 miles (5 kilometers)?


Options are :

  • Accurate Link Budget calculations
  • A minimum antenna gain of 13 dBi
  • System Operating Margin (SOM) of at least 20 dB
  • Accurate Earth Bulge calculations
  • A Fresnel Zone that is at least 60% clear of obstructions

Answer : Accurate Link Budget calculations A Fresnel Zone that is at least 60% clear of obstructions

What phrase defines Equivalent Isotropically Radiated Power (EIRP)?


Options are :

  • Power supplied to the antenna plus antenna gain
  • Reflected power due to an impedance mismatch in the signal path
  • Transmitter output power plus attached cable and connector loss
  • Transmitter output power only

Answer : Power supplied to the antenna plus antenna gain

PW0-105 Certified Wireless Network Administrator Exam Set 2

ABC Company has just purchased a 6 dBi patch antennA. After performing some tests with the 6 dBi antenna, they have concluded that more antenna gain is needed to cover their long hallway.When choosing an antenna with higher gain, what other antenna characteristic will also change?


Options are :

  • Return Loss
  • Fresnel Zone size
  • Beamwidths
  • Maximum input power

Answer : Beamwidths

What statements about the beamwidth of an RF antenna are true?


Options are :

  • Horizontal beamwidth is displayed (in degrees) on the antenna Azimuth Chart.
  • Beamwidth is calculated by the -3 dB points from the center axis, both horizontally and vertically.
  • The lower the gain of an antenna, the more narrow one or both beamwidths become.
  • The RF signal stops propagating at the beamwidth borders.

Answer : Horizontal beamwidth is displayed (in degrees) on the antenna Azimuth Chart. Beamwidth is calculated by the -3 dB points from the center axis, both horizontally and vertically.

What word describes the bending of an RF signal as it passes between mediums of different density?


Options are :

  • Diffraction
  • Reflection
  • Diffusion
  • Refraction

Answer : Refraction

PW0-204 Certified Wireless Security Professional (CWSP) Exam Set 3

What causes an excessively high Voltage Standing Wave Ratio (VSWR) in an 802.11 WLAN?


Options are :

  • Reflected DC voltage on the main RF signal line
  • Refracted RF signal peaks along the main signal path
  • An impedance mismatch between devices in series with the main RF signa
  • Crosstalk (inductance) between adjacent conductors

Answer : An impedance mismatch between devices in series with the main RF signa

Which units of measure are used to describe relative power level changes?


Options are :

  • dBi
  • mW
  • dBm
  • dB

Answer : dBi dB

Which IEEE 802.11 physical layer specification (PHY) provides support for OFDM and HR/DSSS operational compatibility?


Options are :

  • HR/DSSS
  • OFDM
  • HT
  • ERP

Answer : ERP

PW0-071 Certified Wireless Technology Specialist Sales Exam Set 2

What factor is NOT taken into account when calculating the System Operating Margin of a point-to-point outdoor WLAN bridge link?


Options are :

  • Antenna height
  • Tx power
  • Rx cable loss
  • Operating frequency
  • Tx antenna gain

Answer : Antenna height

As an RF wave propagates through space, the wave front experiences natural expansion. What is the detrimental effect of this expansion in a WLAN system?


Options are :

  • Fresnel Zone Thinning
  • Linear Diffusion Loss
  • Signal Attenuation
  • Transmission Obfuscation

Answer : Signal Attenuation

Given: A WLAN transmitter that emits a 200 mW signal is connected to a cable with a 9 dB loss.if the cable is connected to an antenna with a 10 dBi gain, what is the EIRP at the antenna element?


Options are :

  • 250 mW
  • 750 mW
  • 50 mW
  • 500 mW

Answer : 250 mW

PW0-105 Certified Wireless Network Administrator Exam Set 2

What is the most common mount type for connecting a WLAN antenna to an outdoor mast (pole)?


Options are :

  • Magnetic mount with bulkhead adapter
  • U-bolt with base clamp
  • Perforated radome enclosure
  • Suction cups with threaded posts

Answer : U-bolt with base clamp

What facts should you consider when choosing client devices to operate on your WLAN network?


Options are :

  • When ERP-OFDM is used by all stations, UNII band devices can communicate with ISM band devices
  • An 802.11 OFDM system is less susceptible to high-power, narrowband interference than an 802.11 HR/DSSS system.
  • When HR/DSSS devices are present in an ERP BSS, the use of HR/DSSS will diminish network throughput significantly over a purely OFDM environment.
  • An ERP-OFDM system supporting only OFDM data rates can interoperate with HR/DSSS devices.

Answer : When HR/DSSS devices are present in an ERP BSS, the use of HR/DSSS will diminish network throughput significantly over a purely OFDM environment.

Given: XYZ Corporation is experiencing connectivity problems with their existing buildingto-building bridge link. A block wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many frames. The administrator moves the antenna to an area not obstructed by the block wall and then realizes the RF cable cannot reach the new location.if an extension cable is used, what are the likely results?


Options are :

  • The Equivalent Isotropically Radiated Power (EIRP) will decrease.
  • Output power at the Intentional Radiator will decrease due to increased cable resistance.
  • The antenna coverage area will decrease.
  • The data throughput rate will increase because VSWR will decrease

Answer : The Equivalent Isotropically Radiated Power (EIRP) will decrease. The antenna coverage area will decrease.

PW0-071 Certified Wireless Technology Specialist Sales Exam Set 2

Which antenna types can be used in a scenario where simple receive diversity is required?


Options are :

  • Patch
  • Yagi
  • Grid
  • Omni-directional

Answer : Patch Omni-directional

What are some common specifications for 802.11 WLAN antennas?


Options are :

  • Operating Temperature
  • Maximum Input Power
  • Azimuth Beamwidth
  • Spectral Resilience
  • Return Loss Rating
  • Impedance in Ohms

Answer : Operating Temperature Maximum Input Power Azimuth Beamwidth Impedance in Ohms

Given: A 802.11 WLAN transmitter that emits an 80 mW signal is connected to a cable with 3 dB loss.The cable is connected to an antenna with a 16 dBi gain.What is the resultant antenna power output (EIRP)?


Options are :

  • 320 mW
  • 800 mW
  • 1600 mW
  • 1200 mW
  • 160 mW

Answer : 1600 mW

PW0-105 Certified Wireless Network Administrator Exam Set 1

What statements describe the RF cables and connectors that are used with 802.11 WLAN equipment?


Options are :

  • Every RF connector has insertion loss.
  • Two like connectors, manufactured by different companies, may vary in their specifications.
  • RF cables have upper and lower frequency limit specifications
  • 75 ohms is the typical impedance of an 802.11 WLAN connector

Answer : Every RF connector has insertion loss. Two like connectors, manufactured by different companies, may vary in their specifications. RF cables have upper and lower frequency limit specifications

While working on a presentation document in a conference room equipped with a wireless network, you notice that, as you turn your laptop in different directions, your wireless signal strength changes. What statement describes the RF signal property that is primarily responsible for this change in signal strength?


Options are :

  • The RF signal's wavelength is being affected by varying antenna gain.
  • The RF signal's multipath is changing the amount of RF absorbed by nearby objects.
  • The RF signal's amplitude is changing due to a change in the visual line-of-sight.
  • The RF signal's polarization is different than the receiving antennA.

Answer : The RF signal's polarization is different than the receiving antennA.

What factors affect the distance that an RF signal can be effectively received?


Options are :

  • Fresnel zone blockage
  • Transmitting station's antenna type
  • Power over Ethernet (PoE) usage
  • Receiving station's radio sensitivity

Answer : Fresnel zone blockage Transmitting station's antenna type Receiving station's radio sensitivity

CWNA-106 Certified Wireless Network Administrator Exam Set 3

What antenna technologies are used to help overcome null areas of RF coverage due to multipath?


Options are :

  • Transmit Beamforming
  • Simple Diversity
  • Phase Dispersion
  • Circular Polarization
  • Beam Linearization

Answer : Transmit Beamforming Simple Diversity

What statements are true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802.11 WLANs?


Options are :

  • The OFDM PHY is divided into two sub-layers, the LLC and PLCP.
  • UNII band OFDM channels have 20 MHz spacing between center frequencies
  • 16QAM modulation is used at the 54 Mbps data rate.
  • Forty-eight (48) sub-carriers are used as parallel symbol transmission paths.
  • Six (6) "pilot" sub-carriers are used as a reference to disregard frequency and phase shifts of the signal during transmission.

Answer : UNII band OFDM channels have 20 MHz spacing between center frequencies Forty-eight (48) sub-carriers are used as parallel symbol transmission paths.

What characteristics determine the diameter of the first Fresnel Zone for a 802.11 WLAN link?


Options are :

  • Antenna beamwidths
  • Frequency of the transmission
  • Distance between the antennas
  • Size of the antenna elements

Answer : Frequency of the transmission Distance between the antennas

PW0-270 Certified Wireless Analysis Professional (CWAP) Exam Set 6

Given: ABC Company's network administrator was just asked to install a 5 GHz OFDM bridge link between two buildings. He connected a WLAN bridge with a 50-ohm output to a 50-ohm RF coaxial cable.He connected the other end of the RF coaxial cable to a 25-ohm, 6 dBi Yagi antennA.What is the maximum VSWR between the WLAN bridge and the Yagi antenna?


Options are :

  • 1.1:1
  • 1.2:1
  • 2.0:1
  • 1.0:1

Answer : 2.0:1

Given: Return Loss is the decrease of forward energy in a system because some of the power is being reflected back toward the transmitter.What can cause a high return loss in an RF transmission system?


Options are :

  • The use of multiple connector types in the RF system (e.g. N-type and SMA-type) E. Low output power at the transmitter and use of a high-gain antenna
  • Cross-polarization of the RF signal as it passes through the RF system
  • An impedance mismatch between devices in the RF system
  • A Voltage Standing Wave Ratio (VSWR) of 1.5:1

Answer : An impedance mismatch between devices in the RF system

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