What are unconnected lookups?
Unconnected lookup the input ins take by the LKP operation. In this type of lookup method, User-defined values are disregarded in the unconnected lookups.
The answer to this Microsoft Azure interview question should be that in the unconnected lookups the input is taken by the LKP operation. Nature is dynamic having a single output port. User-defined values are disregarded in the unconnected lookups.