Physical resource
Actual resources in NFVI; not visible to Consumer.
+ Resource zone
+ A set of NFVI hardware and software resources logically grouped
+ according to physical isolation and redundancy capabilities or to
+ certain administrative policies for the NFVI [NFVIFA010]_
+
VIM
Virtualized Infrastructure Manager; functional block that is responsible
for controlling and managing the NFVI compute, storage and network