802.11b operates at 2.4GHz for internet access only, has a maximum speed of 11Mbps, and has the cheapest equipment, but performance decreases with obstacles; 802.11g also operates at 2.4GHz for internet access and file sharing, has faster speeds of 54Mbps (24.7Mbps real), can communicate with 802.11b, and allows much faster file transfers and speeds up to 108Mbps for large data transfers within a local area network.