CWNA: Certified Wireless Network Administrator v109 — Question 14

Which IEEE 802.11 physical layer (PHY) specification includes support for operation in the 2.4 GHz, 5 GHz, and 6 GHz bands?

Answer options

• A. VHT (802.11ac)
• B. HR/DSSS (802.11b)
• C. HE (802.11ax)
• D. HT (802.11n)

Correct answer: C

Explanation

The correct answer is C, HE (802.11ax), as it is designed to operate across 2.4 GHz, 5 GHz, and 6 GHz bands, making it versatile for modern wireless networks. The other options, A (VHT), B (HR/DSSS), and D (HT), are limited to specific bands and do not support the 6 GHz frequency, which is essential for higher throughput and better performance in today's Wi-Fi technology.