What is the use of an IP Configuration?

In case the company does not want any users to log in at a specific location(s), the company can enter and restrict that IP address. Users within that IP range will not be able to log in. 

What is the difference between Applicant Status and Application Status?

An applicant status signals whether a candidate profile is active, inactive, or on hold. An application status refers to a candidate’s actual application, e.g., “submitted,” “interviewed scheduled,” “placed,” “on hold,” etc.