Chapter 8 quiz

Question 1

What kind of carrier-sensing mechanism is used to detect RF power from non-Wi-Fi devices?

Answer 1

ED (Energy Detect)

Question 2

What does the Duration value represent when it is used to set the NAV in a STA?

Answer 2

The time to complete the transaction after the current frame

Question 3

What IFS type is variable depending on the priority of a frame waiting for transmission?

Answer 3

AIFS

Question 4

After the IFS, what must count down before a STA can attempt to transmit?

Answer 4

Backoff timer

Question 5

When 40MHz and larger channels are used, what portion of the channel is used for BSS operations?

Answer 5

The primary channel

Question 6

What is used by APs to clear the channel as a protection mechanism, but not typically used by client STAs?

Answer 6

CTS-to-Self

Question 7

When a legacy power save client awakes and sees traffic waiting based on the TIME in the Beacon frame, what can it do to inform the AP that it is awake?

Answer 7

Send a PS-POLL frame

Question 8

Why can a VHT device use a single PPDU format and still be compatible with older 5 GHz devices?

Answer 8

The VHT preamble is backward compatible

Question 9

What is the highest AC in EDCA?

Answer 9

AC_VO

Question 10

What is the function called that processes the individual AC queues in a QoS STA?

Answer 10

EDCAF