Chapter 8 quiz Flashcards
What kind of carrier-sensing mechanism is used to detect RF power from non-Wi-Fi devices?
CS
NAV
ED
AC
ED (Energy Detect)
What does the Duration value represent when it is used to set the NAV in a STA?
The length of time it will take to transmit the current frame
The time to complete the transaction after the current frame
The time it takes to send the ACK for the current frame
None of these
The time to complete the transaction after the current frame
What IFS type is variable depending on the priority of a frame waiting for transmission?
DIFS
SIFS
AIFS
RIFS
AIFS
After the IFS, what must count down before a STA can attempt to transmit?
Backoff timer
Carrier sense
Energy detect
None of these
Backoff timer
When 40MHz and larger channels are used, what portion of the channel is used for BSS operations?
The second portion
The first portion
All of it
The primary channel
The primary channel
What is used by APs to clear the channel as a protection mechanism, but not typically used by client STAs?
CTS-to-Self
RTS/CTS
DTIM
ATIM
CTS-to-Self
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?
Send a Probe request frame
Send a PS-POLL frame
Just wait, the AP will detect it
None of these
Send a PS-POLL frame
Why can a VHT device use a single PPDU format and still be compatible with older 5 GHz devices?
It actually uses the identical entire PPDU format as 802.11a
It uses the Non-HT PPDU format of 802.11n
The VHT preamble is backward compatible
It transmits two PPDUs at the same time - one compatible with 802.11a and the other VHT-specific
The VHT preamble is backward compatible
What is the highest AC in EDCA?
AC_BK
AC_BE
AC_VI
AC_VO
AC_VO
What is the function called that processes the individual AC queues in a QoS STA?
EDCA
EDCF
EDCAF
AIFSN
EDCAF
