This read-only EthernetMediaType object reports which Ethernet media type was automatically selected on an Ethernet Network Port that supports auto media selection. Admins check this on ports supporting multiple media options (like combo copper/fiber ports) to see which physical medium the port actually chose to use, since it may differ from a naive expectation. For example, on a combo port with both an SFP and an RJ45 populated, an admin would read cmEthernetNetPortMediaTypeAutoSelected to confirm the port auto-selected fiber rather than unexpectedly defaulting to the copper interface.