What you're typing there looks a lot like a MAC Address which is a hardware address unique to every NIC.
This particular one is licensed to DELL Inc.
Ethernet is not a device, it is software protocol. There is hardware to implement the protocol, e.g. NICs, switches, hubs, etc.
Removes the Ethernet header and trailer
To connect your device to the internet using an Ethernet cable adapter for the wall, simply plug one end of the Ethernet cable into the adapter and the other end into your device's Ethernet port. This will establish a wired connection to the internet through the wall adapter.
"PCI communications device" is displayed in the Device Manager when Windows does not have a driver for a PCI device that is used for networking in some fashion. It could be a dial-up modem, Ethernet controller, or a wireless card. You will need to download drivers from your computer manufacturer to display a more specific name in the Device Manager and make the yellow question mark go away.
It is a piece of software that is supplied by the device manufacturer.
Ethernet is bi-directional; it both transmits and receives data.
a repeater
A device with wireless connectivity or Ethernet ports, which otherwise connects a series of devices in a network topology.
ethernet controller is the device which deals with lan card means local area connection
removes the Ethernet header and trailer
Integrated Device Manufacturer.
To test an Ethernet port, you can use a known working Ethernet cable and connect it to a device with a functioning Ethernet port. Check if the device recognizes the connection and can access the network. You can also use a network testing tool to check for connectivity and data transfer speeds.