CWNA RF Fundamentals & Signal Propagation 2

Question 1

Which type of antenna radiates power equally in all horizontal directions?

Accepted Answer

Omnidirectional antenna

Answer

An omnidirectional antenna radiates power equally in all horizontal directions, creating a 360° coverage pattern.

Question 2

What does EIRP stand for in wireless networking?

Accepted Answer

Effective Isotropic Radiated Power

Answer

EIRP (Effective Isotropic Radiated Power) represents the total power radiated by a transmitter compared to an isotropic antenna.

Question 3

Which frequency band typically experiences greater signal absorption by water vapor and building materials?

Accepted Answer

Both 2.4 GHz and 5 GHz experience more than 900 MHz

Answer

Both 2.4 GHz and 5 GHz suffer greater attenuation from obstacles than 900 MHz because shorter wavelengths are absorbed more readily by materials.

Question 4

What is the term for the loss of signal strength as it travels through free space without any obstacles?

Accepted Answer

Free-space path loss

Answer

Free-space path loss describes the reduction in signal power solely due to distance in an obstacle-free environment.

Question 5

In dB math, what does adding 3 dB to a power level represent?

Accepted Answer

Double the power

Answer

Adding 3 dB to a power level approximately doubles the power, since 10^(3/10) ≈ 2.

CWNA - Wireless Network Administrator Practice Test