CWNA-106 Practice Test

What word describes the bending of an RF signal as it passes through a medium of a varying
density from that of free space?

A.

Diffraction

B.

Reflection

C.

Refraction

D.

Diffusion

E.

Scattering

What can cause an excessively high VSWR (Voltage Standing Wave Ratio) in a WLAN RF
transmission line?

A.

An impedance mismatch in the RF cables and connectors

B.

Reflected direct current (DC) voltage on the main RF signal line

C.

Attenuation of the RF signal as it travels along the main signal path

D.

Crosstalk (inductance) between adjacent RF conductors 

What factors influence the distance that an RF signal can be effectively received? (Choose 3)

A.

Transmitting station’s power source

B.

Receiving station’s radio sensitivity

C.

Free Space Path Loss

D.

MAC layer encryption

E.

Transmitting station’s output power

F.

Temperature in the Fresnel zone

As an RF wave propagates through space, the wave front experiences natural expansion that
reduces its signal strength in an area. What term describes the rate at which this expansion
happens?

A.

MU-MIMO

B.

Inverse square law

C.

Path spread phenomenon

D.

Fresnel zone thinning

E.

Ohm’s law

Return Loss is the decrease of forward energy in a system when some of the power is being
reflected back toward the transmitter.
What will cause high return loss in an RF transmission system, including the radio, cables,
connectors and antenna?

A.

A Voltage Standing Wave Ratio (VSWR) of 1:1

B.

An impedance mismatch between components in the RF system

C.

Cross-polarization of the RF signal as it passes through the RF system

D.

The use of cables longer than one meter in the RF system

E.

High output power at the transmitter and use of a low-gain antenna