Final answer:
The technology that uses the 2.4-GHz band and operates at 54 Mbps is Wi-Fi, under the IEEE 802.11g standard.
Step-by-step explanation:
The technology that uses the 2.4-GHz band and runs at 54 Mbps is Wi-Fi, specifically the IEEE 802.11g standard. This standard is one of several established for wireless local area networks (WLANs). Devices that operate in the 2.4-GHz range include Wi-Fi routers, Bluetooth devices, and some cordless telephones, among other wireless communication technologies.
The 2.4-GHz band is particularly popular for Wi-Fi because it offers a good balance between range and bandwidth, allowing data to be transmitted over reasonable distances without requiring a large amount of power. This band can become crowded, leading to possible interference since other devices like microwaves and Bluetooth gadgets also use the 2.4-GHz frequency.
54 Mbps is a rate that was considered quick for wireless transmission when the 802.11g standard was first introduced, although current Wi-Fi standards like 802.11n and 802.11ac offer much faster speeds.