CWNA-108 Exam QuestionsBrowse all questions from this exam

CWNA-108 Exam - Question 20


When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

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Correct Answer: B

VHT TXOP power save improves battery life by allowing the WLAN transceiver to disable more components when in a low power state. This capability enables the device to consume less power compared to the legacy Power Save mode, thus extending battery life on a WLAN.

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Dat1992Option: C
Aug 31, 2023

C is correct. C. The VHT TXOP feature, which uses the partial AID in the PLCP header to determine if an incoming frame is for the listening STA, improves power management because the listening STA can sleep earlier in the frame transmission.

Alonzo_HarrisOption: C
Dec 12, 2023

The VHT TXOP feature, which uses the partial AID in the PLCP header to determine if an incoming frame is for the listening STA, improves power management because the listening STA can sleep earlier in the frame transmission. Adding more streams increases power consumption. While 256-QAM may have a side benefit of reducing power consumption (due to shorter transmission times at higher data rates), it was not designed to improve power management. The standardized, full-time use of A-MPDU does not have a significant impact on power management either.