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Exam CWNA-108 topic 1 question 25 discussion

Actual exam question from CWNP's CWNA-108
Question #: 25
Topic #: 1
[All CWNA-108 Questions]

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

  • A. Legacy Power Save mode was removed in the 802.11ac amendment.
  • B. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.
  • C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
  • D. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
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Suggested Answer: C 🗳️

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Alonzo_Harris
7 months ago
Selected Answer: 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. 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.
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Dat1992
10 months, 2 weeks ago
Selected Answer: C
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.
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