Chapter 4 quiz Flashcards
When creating an outdoor bridge link, what is the recommended clearance for the first Fresnel zone?
60%
80%
20%
40%
80%
You are creating a bridge link that spans 12 miles. You have inspected the area to identify trees and other interferers. What else should be considered?
Weather in the area
Daytime vs nighttime propagation
Earth bulge
Other RF signals between the two endpoints
Earth bulge
You are selecting an antenna for a MIIMO AP that supports external antennas. You want to mount the antenna on the wall at the exterior of the target coverage area. What kind of antenna should you use?
Yagi
Omni
Grid
Patch
Patch
You are creating a very long distance bridge link in an area known for high winds. What kind of antenna would be useful for this scenario?
Parabolic dish
Omni
Patch
Grid
Grid
What kind of lighting arrestor is best for direct lighting strikes?
Quick response arrestor
Lead arrestor
Water-based arrestor
No lighting arrestor protects against direct strikes
No lighting arrestor protects against direct strikes
At what signal loss level is the beamwidth of an antenna calculated?
6 dB
10 mW
3 dB
25 mW
3dB
Why are Yagi and semi-directional SISO antennas less popular for indoor WLAN deployments today?
They are no longer supported by vendors
They can’t transmit OFDM signals
They do not provide the capacity needed in modern WLANs
They do not provide the signal quality of dipole antennas
They do not provide the capacity needed in modern WLANs
What receive technology was introduced in 802.11n and allows the receiver to combine multiple copies of the received signal from multiple antennas to increase received signal strength?
Spatial multiplexing
MRC
Transmit Beamforming
40MHz channels
MRC
What is another term often used for an Elevation chart?
Horizontal chart
Vertical chart
H-Plane chart
Beam h chart
Vertical chart
Which antenna specification defines the highest gain antenna?
7 dBi
6 dBi
Standard dipole
Isotropic radiator
6 dBi
