CWAP Chapter 8 questions with correct answers

What 802.11 amendment defined new power management methods, involving the STA entering the doze state, that are used in real-world devices? Answer 802.11n defined unscheduled PSMP 802.11e defined U-APSD which are used in real-world stations and APs that are WMM Power Save certified. Which of the following frames types is typically used by stations to notify an AP of a change in power management mode? Answer Null data frames use the power management flag in the 802.11 header to change between active mode and power save mode. PS-Poll frames are used in power management, but they are not typically used to retrieve buffered unicast frames from the AP, not to notify the AP of a change in power state. What state drains most of the battery life? Answer Transmit What sate drains the least amount of battery life? Answer Doze What power management method uses the PS-Poll frame? Answer 802.11 power management. The Bitmap offset defines: Answer how many 8-bit sequences may be eliminated from the Partial Virtual Bitmap because of the stations not having unicast frames buffered at the AP.