Fast Ethernet is a standard for Ethernet networks that supports data rates up to 100 megabits per second (Mbps). Fast Ethernet was developed in the early 1990s as an extension of the original Metro Ethernet standard, which supported data rates up to 10 Mbps. The Fast Ethernet standard is based on the same physical layer specifications as regular Ethernet, but it uses a different {Media/Medium Access Control (M/MAC)} method and frame format.

The main advantage of Fast Ethernet over regular Ethernets is its higher data rate. This allows for faster file transfers and increased network throughput. In addition, Fast Ethernets can be used to connect devices that require high bandwidth, such as video conferencing systems or multimedia servers.

Despite its advantages, there are some disadvantages to using Fast Ethernet. One issue is that it can be difficult to upgrade an existing network from regular to fast speeds without replacing all of the equipment. Another potential problem is compatibility with older devices; while most newer devices support fast speeds, some older ones may not be able to work at these speeds properly.