CWS CWS WLAN Hardware and Antennas 4

Question 1

A Yagi antenna is best described as which type of antenna?

Accepted Answer

Highly directional with multiple elements along a boom

Answer

A Yagi antenna uses a driven element, reflector, and multiple director elements along a boom to achieve high gain in a single forward direction.

Question 2

What is co-channel interference (CCI) in a WLAN deployment?

Accepted Answer

Interference between access points using the same channel

Answer

Co-channel interference occurs when two or more access points operate on the same channel within range of each other, competing for airtime.

Question 3

Which cable type is preferred for connecting outdoor antennas to access points over long cable runs to minimize signal loss?

Accepted Answer

Low-loss coaxial cable (e.g., LMR-400)

Answer

Low-loss coaxial cables like LMR-400 have significantly lower attenuation per foot than standard cables, preserving signal strength over long outdoor runs.

Question 4

What is a patch antenna primarily used for in WLAN deployments?

Accepted Answer

Directional coverage in a specific area like a hallway or outdoor sector

Answer

Patch antennas provide directional coverage with moderate gain, commonly used for hallways, outdoor coverage sectors, and focused indoor zones.

Question 5

What is the significance of the Fresnel zone in outdoor wireless link planning?

Accepted Answer

It is the elliptical area around the line of sight that must be at least 60% clear for optimal signal

Answer

The first Fresnel zone is an elliptical volume around the direct path between antennas; obstructing more than 40% of it significantly degrades link performance.

CWS Exam Practice Test

CWS Exam Practice Test

CWS CWS WLAN Hardware and Antennas 4