If you are outputting the signal from your CXN100 via balanced (XLR) or unbalanced (RCA) outputs, you are utilizing the CXN100's built in DAC.
If you are instead using either of the digital outputs of the CXN, (COXIAL or OPTICAL) the digital signal will bypass the DAC in CXN and will instead be processed by the unit connected to the digital output, E.g., your external DAC or amplifier.