CWNA 1-1

1.

1 point

A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 10 dBi gain, what is the EIRP
at the antenna element?

20 dBm

13 dBm

30 dBm

10 dBm

26 dBm

2.

1 point

What term describes the effect of increasing the intensity of an RF wave with an antenna by focusing the energy in a specific direction?

Beam Compression

Active Amplification

Distributed Radiation

Passive Gain

RF Flooding

3.

1 point

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

Diffraction

Reflection

Refraction

Diffusion

Scattering

4.

1 point

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

Transmitting station's output power

Temperature in the Fresnel zone

Receiving station's radio sensitivity

MAC layer encryption

Transmitting station's power source

Free Space Path Loss

5.

1 point

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 Voltage Standing Wave Ratio (VSWR) of 1:1

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

An impedance mismatch between components in the RF system

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

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

6.

1 point

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?

Path spread phenomenon

Fresnel zone thinning

Inverse square law

MU-MIMO

Ohm's law

7.

1 point

What factors are taken into account when calculating the Link Budget of a point-to-point outdoor WLAN bridge link?

Antenna height

Transmit antenna gain

Transmit power

Operating frequency

8.

1 point

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

An impedance mismatch in the RF cables and connectors

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

Crosstalk (inductance) between adjacent RF conductors

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

9.

1 point

What phrase defines Equivalent Isotropically Radiated Power (EIRP)?

The power output from the radio into the RF cable

Reflected power due to an impedance mismatch in the signal path

The highest RF signal strength that is transmitted from a given antenna

Power supplied from the transmission line to the antenna input

The power output from the radio after cable losses

10.

1 point

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

The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.

The Fade Margin of a long-distance radio link should be equivalent to the receiver's antenna gain.

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.

A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.