A mode of operation are conditions under which the system is allowed to function. Systems can use different modes depending on what is going on in the system. The four modes are outlined below.
Dedicated Security Mode - When all uses are able to access all data being processes within a system. Users have normally signed a non-disclosure agreement in this one.
System High Security Mode - All users have the need to know about some of the data, not every bit of it.
Compartmented Security Mode - Every user can access some data, but only based on a need to know or if they go through a formal access approval process.
Multilevel Security Mode - Users can only get to the data that they have explicitly cleared to access. Bell-LaPadula model is good example that uses this mode.
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