Which 802.11 amendment is an extension of the standard, offering up to 54 Mbps using OFDM and operating in the 2.4 GHz band?

Which 802.11 amendment is an extension of the standard, offering up to 54 Mbps using OFDM and operating in the 2.4 GHz band?

• A. 802.11e
• B. 802.11n
• C. 802.11g
• D. 802.11d

Answer: (C)

802.11g is designed to extend the wireless standard by bringing OFDM-based data rates to the 2.4 GHz band, reaching up to 54 Mbps. It uses the same 2.4 GHz spectrum as 802.11b but switches to the more efficient OFDM modulation, which enables higher speeds. Importantly, it remains backward compatible with 802.11b devices, so older devices can still operate in the same network as newer ones. While the nominal PHY rate is 54 Mbps, real-world speeds are typically lower due to overhead and interference common in the 2.4 GHz band. The other amendments focus on different goals—quality of service enhancements, higher throughput with multiple antennas, or regulatory domain information—so they don’t match this description of an OFDM-based extension delivering up to 54 Mbps in 2.4 GHz.

802.11g is designed to extend the wireless standard by bringing OFDM-based data rates to the 2.4 GHz band, reaching up to 54 Mbps. It uses the same 2.4 GHz spectrum as 802.11b but switches to the more efficient OFDM modulation, which enables higher speeds. Importantly, it remains backward compatible with 802.11b devices, so older devices can still operate in the same network as newer ones. While the nominal PHY rate is 54 Mbps, real-world speeds are typically lower due to overhead and interference common in the 2.4 GHz band. The other amendments focus on different goals—quality of service enhancements, higher throughput with multiple antennas, or regulatory domain information—so they don’t match this description of an OFDM-based extension delivering up to 54 Mbps in 2.4 GHz.