How many types of Ethernet are there?

There are three different types of ethernets - fast ones, at least. The first type is called Fast Ethernet: 100BASE-TX and it is to be used with level 5 UTP cable. Then there is 100BASE-FX which is for use with fiber-optic cable which is widely available now in larger areas.

Thirdly, there is 100BASE-T4. This type of ethernet utilizes an extra two wires for use with level 3 UTP cable which can make it super efficient. As ethernet improves and keeps up with the times and the technology and the devices that come out, the types of ethernet work to fulfill the needs presented so it doesn't become outdated..