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A network interface is … the part where the network cable connects to. Or where the serial cable connects to. Or a virtual connection point, such as an end of a VPN tunnel or a virtual network connection between two virtual machines on the same physical machine. Or, as you implied, a pseudo-interface for loopback.
– Scott - Слава Україні
Commented Dec 20, 2012 at 1:52
Also, I believe multicast (class D) IP addresses are not assigned to interfaces.
– Scott - Слава Україні
Commented Dec 20, 2012 at 1:54
interface address.. would be the network address at that network interface.
– barlop
Commented Feb 19, 2015 at 10:22

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