@danieldibswe There should be L2 connectivity between the HB interfaces; you can use a switch or both units can be in different DC.
Also, you can form HA Cluster using FGSP or FGCP (more common).
@lionel_federer I never liked the MS curriculum from NED. They've also increased the seats from 140 to 210 per batch for many departments. It's all about business rather than maintaining standards.