Oracle Exam 1Z0-1072-20 Topic 4 Question 11 Discussion

You can think of a DRG as a virtual router that provides a path for private traffic (that is, traffic that uses private IPv4 addresses) between your VCN and networks outside the VCN's region.

You use a DRG when connecting your existing on-premises network to your virtual cloud network (VCN) with one (or both) of these:

IPSec VPN

Oracle Cloud Infrastructure FastConnect(Private Only)

You also use a DRG when peering a VCN with a VCN in a different region:

Remote VCN Peering (Across Regions)