CWNA PW0-105 Exam Questions & Practice Test – Free Download (11-20)

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

A.    Diffraction
B.    Reflection
C.    Refraction
D.    Diffusion
E.    Scattering

Answer: C

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

A.    An impedance mismatch between devices in series with the main RF signal
B.    Reflected DC voltage on the main RF signal line
C.    Refracted RF signal peaks along the main signal path
D.    Crosstalk (inductance) between adjacent conductors

Answer: A

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

A.    Transmitting station’s antenna type
B.    Receiving station’s radio sensitivity
C.    Fresnel zone blockage
D.    Power over Ethernet (PoE) usage
E.    Antenna connector type
F.    Distance between access points

Answer: ABC

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?

A.    Linear Diffusion Loss
B.    Signal Attenuation
C.    Transmission Obfuscation
D.    Fresnel Zone Thinning
E.    Azimuth Inflation

Answer: B

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?

A.    1.0:1
B.    1.1:1
C.    1.2:1
D.    1.5:1
E.    2.0:1
F.    1.0:2

Answer: E

What are two channel modes specified by the 802.11n (High Throughput) PHY? (Choose two)

A.    20 MHz
B.    20/40 MHz
C.    5/10 MHz
D.    22 MHz
E.    80 MHz
F.    160 MHz

Answer: AB

In an 802.11b/g system, what channels are considered non-overlapping? (Choose two)

A.    Channels 5 and 10
B.    Channels 1 and 5
C.    Channels 3 and 7
D.    Channels 2 and 8
E.    Channels 8 and 11
F.    Channels 10 and 13

Answer: AD

What problems may occur when there are hidden nodes in the BSS?

A.    Increase in downlink (transmitted by AP) frame retries
B.    High retransmission count for a subset of client stations
C.    Use of frame fragmentation with fragment bursts
D.    Excessive use of null data frames
E.    Duration values vary widely in each data frame

Answer: B

How is throughput capacity scaled in a single channel architecture (SCA) WLAN system?

A.    By increasing transmit power and placing APs that are on a single channel farther from one another.
B.    By adding more SSIDs to existing APs to spread users across different contention domains.
C.    By adding APs to increase the number of non-overlapping channel layers.
D.    By using downlink data compression and uplink flow control at the AP.
E.    By using a single 802.11n radio to transmit simultaneous downlink data streams to different users.

Answer: C

What phrase defines Equivalent Isotropically Radiated Power (EIRP)?

A.    Radio transmitter output power minus attached cable and connector loss
B.    Radio transmitter output power only
C.    Power supplied to the transmit antenna input plus antenna gain
D.    Reflected power due to an impedance mismatch in the signal path
E.    Power supplied from the transmission line to the antenna’s input

Answer: C

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