I have just installed free ZA.

On the Firewall page, zones tab, 4 systems show as active:
Realtec RTL8139/810x Family Fast Ethernet NIC-Packet Scheduler Miniport for the internet zone; DHCP server for trusted zone; printer for trusted zone; loopback adapter for trusted zone.
The printer makes sense and read up DHCP servers which also seems ok.
Loopback adapter looks harmless though I don't know what that is.
But I am concerned about the Realtec thingy.
Couldn't find anything about it on the net.
Is it ok/safe?
Near novice