If an End System was not active for the amount (or greater) of days that is defined within the ‘Age ‘End-Systems older than’ variable, the end system is removed from the NAC.

The default value is 90 days.   For example, if an end system is not active for >90 days, using this default setting and the default ‘Remote Associated Registration Data’ is checked, the End system is removed completely from the NAC.