Is this same as *multi-netting* ? I think there is a small
     difference between *multi-netting* and *subinterfaces*.
     Multi-netting can be applicable to BCs also (not only NBMAs)?!?

If by "multi-netting" you mean assigning multiple subnets to a
physical interface, this isn't necessarily the same. The key to
subinterfaces is that an incoming packet must have sufficient
information to be able to demultiplex to the proper subinterface. You
can't assign multiple subnets to an Ethernet, for instance, using
subinterfaces, because you can't tell by looking at an incoming packet
the interface with which it is associated. (But you can if you are
using VLANs by looking at the VLAN ID, or on ATM or FR by looking at
the VC information.)

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