How is high availability of the NSX Edge Gateway accomplished?
A. HA Application Monitoring on the Edge Gateway sends a heartbeat to the ESXi host.
B. VMware Tools on the Edge Gateway sends a heartbeat to the ESXi host.
C. The Edge appliance sends a heartbeat through an uplink interface.
D. The Edge appliance sends a heartbeat through an internal interface.
Correct answer is D
All NSX Edge services run on the active appliance. The primary appliance maintains a heartbeat with the standby appliance and sends service updates through an internal interface.
https://docs.vmware.com/en/VMware-NSX-Data-Center-for-vSphere/6.2/com.vmware.nsx.admin.doc/GUID-6C4F0C33-C6DD-432B-AA91-10AD6B449125.html