Which WLAN IEEE specification supports up to 54Mbps at 2.4GHz?

The WLAN IEEE specification that supports data rates of up to 54 Mbps at 2.4 GHz is the 802.11g standard. This standard was developed to enhance the capabilities of wireless networks by providing higher speeds while maintaining backward compatibility with the earlier 802.11b standard.

The key attributes of 802.11g include its use of the same 2.4 GHz frequency band as 802.11b, allowing devices from both standards to interoperate seamlessly. The increase in speed to 54 Mbps is primarily achieved through the use of clearer modulation techniques, particularly the use of Orthogonal Frequency Division Multiplexing (OFDM), which significantly improves data transmission rates over the earlier Direct Sequence Spread Spectrum (DSSS) method used by 802.11b.

In summary, the 802.11g specification is designed for higher throughput while utilizing the same frequency range as its predecessors, thereby providing both speed and legacy support, making it the correct choice for the specification that supports up to 54 Mbps at 2.4 GHz.