Ethernet interfaces are the part of the networking and it is automatically identified by the system using different naming conventions. It is represented by ethX, where X= any numeric value. The default interface of the system is named as eth0 and it will go on after this. To identify the Ethernet interface the command that is used:

ifconfig -a | grep eth

eth0

Link encap:Ethernet

HWaddr 00:15:c5:4a:16:5a

The command will show all the interfaces that are associated with the system.