CWNA: Certified Wireless Network Administrator v108 — Question 21

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 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.

Correct answer: C

Explanation

The correct answer is C because VHT TXOP power save uses the partial AID to help clients recognize their specific frames, thus improving efficiency. While option A is incorrect as Legacy Power Save mode still exists, option B does not accurately describe the primary function of VHT TXOP power save, and option D is misleading since both modes allow sleep states but do so differently.