What is the maximum speed supported by 802.11b?

The maximum speed supported by the 802.11b standard is indeed 11 Mbps at a frequency of 2.4 GHz. This standard, which is one of the earlier Wi-Fi protocols, was developed to provide wireless network connectivity but had limitations in terms of speed compared to later standards. Its maximum data rate of 11 Mbps is a significant feature that distinguishes it from other standards like 802.11a and 802.11g, which offer higher speeds and operate at different frequencies.

The other options refer to different standards: 802.11a (54 Mbps at 5 GHz) and later standards like 802.11n and 802.11ac that support higher speeds in the 5 GHz band. These comparisons highlight the evolution of wireless technology, where newer standards have increasingly greater throughput capabilities. Therefore, the choice indicating 11 Mbps at 2.4 GHz is the only correct representation of the maximum speed supported by 802.11b.