CWNA: Certified Wireless Network Administrator v109 — Question 4

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

Answer options

• A. Legacy Power Save mode was made obsolete 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

Correct answer: C

Explanation

The correct answer is C because VHT TXOP power save utilizes the partial AID to assist clients in identifying their specific frames, allowing for more efficient power management. Options A and D are incorrect as they do not directly address the battery life improvements provided by VHT TXOP power save. Option B is misleading since it implies more components are disabled, but it doesn't explain the specific mechanism of frame identification that enhances power efficiency.