Chapter 7 - MAC Operations

Question 1

What field reveals the priority of an 802.11 frame using QoS?
a. HT information
b. HT capability
c. ERP Element
d. QoS control

Answer 1

QoS control

Question 1

The WMM-PS power save solution is roughly equivalent to what?
a. U-APSD
b. S-APSD
c. Legacy Power Save
d. Dozing mode

Answer 1

Unscheduled-Auto Power Save Delivery

Question 2

What happens to the duration field duration value as you move through the RTS, CTS, Data, Ack process?
a. it increments
b. it decrements
c. it stays the same
d. it is not used

Answer 2

it decrements

Question 3

How long is a SIFS in HT and VHT 5 GHz operations?
a. 10 microseconds
b. 9 microseconds
c. 16 microseconds
d. 20 microseconds

Answer 3

16 microseconds in all 5 Ghz PHY

10 microseconds in 2.4 Ghz

Question 4

If used at all, when is a PS-Poll frame used?
a. When a station needs to setup a Block Ack agreement
b. When a station requires the use of EDCA
c. When a station wants to use RTS/CTS
d. When a station wakes from sleep

Answer 4

When a station wakes from sleep

Question 5

What kind of frame is an Add Block Request frame?
a. Data
b. QoS Data
c. Action
d. Beacon

Answer 5

Action frame

Question 6

What defines the immediate versus delayed Block Ack in a Block Ack agreement?
a. It is set automatically based on the PHY
b. The Block Ack Policy
c. It is set automatically based on the data rate
d. Immediate is never used and delayed is always used

Answer 6

The Block Ack Policy

Question 7

What does it mean when a station sends a frame to the AP with the Power Management bit set to 1?
a. The station is awake
b. The station is going to sleep
c. The station wants the AP to wake up
d. The station wants the AP to go to sleep

Answer 7

The station is going to sleep

Question 8

Non-ERP Present is set to 1. What is Use Protection set to?
a. 0
b. 1
c. 2
d. 3

Answer 8

1

If non-ERP is set to 1, Use protection is always set to 1