CWNA General Information 4

Question 1

What is the minimum System Operating Margin (SOM) typically recommended for a reliable outdoor wireless bridge link?

Accepted Answer

10 dB

Answer

A minimum SOM of 10 dB is generally recommended for outdoor links to account for environmental factors like rain fade and obstructions.

Question 2

Which 802.11 standard first defined operation in the 6 GHz frequency band?

Accepted Answer

802.11ax

Answer

802.11ax (Wi-Fi 6E) was amended to include operation in the 6 GHz band, providing access to up to 1.2 GHz of additional spectrum in the US.

Question 3

What is the role of the Distribution System (DS) in an 802.11 ESS?

Accepted Answer

It is the wired backbone interconnecting multiple APs

Answer

The Distribution System is typically an Ethernet backbone that interconnects multiple APs, enabling stations to roam across the ESS.

Question 4

In 802.11 power management, what term describes the buffering of frames by an AP for sleeping client stations?

Accepted Answer

Traffic Indication Map (TIM)

Answer

The TIM information element in beacon frames indicates which sleeping stations have buffered unicast frames waiting at the AP.

Question 5

What does the Fresnel Zone concept determine in outdoor wireless link planning?

Accepted Answer

The volume of space around the LOS path that must remain clear of obstructions

Answer

The Fresnel Zone is an ellipsoidal region around the line-of-sight path; obstructions within this zone (especially the first zone) cause significant signal diffraction and loss.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA General Information 4