Private IP addresses allow Azure resources to communicate with other resources in a virtual network or an on-premises network through a VPN Gateway or ExpressRoute circuit, without using an internet-reachable IP address.
- Chapter 4 Implement Virtual Networks
- from Exam Ref 70-533 Implementing Microsoft Azure Infrastructure Solutions
- Publisher: Microsoft Press
- Released: January 2018
That is correct because they use the Wan, an internal internet to communicate each other. Public IP is not in used.
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