802.11ac wireless networks primarily operate in which frequency band and use which technique to boost throughput?

802.11ac wireless networks primarily operate in which frequency band and use which technique to boost throughput?

• A. 2.4 GHz with CSMA/CD
• B. 60 GHz with beamforming
• C. 5 GHz with MIMO
• D. 2.4 GHz with OFDMA

Answer: (C)

802.11ac boosts throughput primarily by using the 5 GHz spectrum and multiple-input, multiple-output (MIMO) technology. The 5 GHz band offers more available channels and allows wider channel widths (like 80 or 160 MHz), which directly increases potential data rates and reduces interference compared to the crowded 2.4 GHz band. At the same time, MIMO uses multiple antennas to transmit and receive several data streams at once, enabling spatial multiplexing so more data can travel simultaneously. Together, the larger, cleaner spectrum and parallel data streams deliver higher speeds than earlier Wi‑Fi generations. The other options don’t fit because CSMA/CD is an Ethernet-era approach not used for Wi‑Fi, 60 GHz is associated with different short-range, high‑frequency standards, and OFDMA is a feature of newer Wi‑Fi 6 (802.11ax) rather than 802.11ac.

802.11ac boosts throughput primarily by using the 5 GHz spectrum and multiple-input, multiple-output (MIMO) technology. The 5 GHz band offers more available channels and allows wider channel widths (like 80 or 160 MHz), which directly increases potential data rates and reduces interference compared to the crowded 2.4 GHz band. At the same time, MIMO uses multiple antennas to transmit and receive several data streams at once, enabling spatial multiplexing so more data can travel simultaneously. Together, the larger, cleaner spectrum and parallel data streams deliver higher speeds than earlier Wi‑Fi generations. The other options don’t fit because CSMA/CD is an Ethernet-era approach not used for Wi‑Fi, 60 GHz is associated with different short-range, high‑frequency standards, and OFDMA is a feature of newer Wi‑Fi 6 (802.11ax) rather than 802.11ac.