I find this document below hard to follow or understand. Can someone explain it to me in simpler terms? For example, suppose I have the following zones already: Trust, Untrust, VPN. What would this map to in SDWAN? What is zone-internal? Is that Trust? Where exactly is that used by SDWAN?
Your question is kinda hard to follow. What are you trying to understand? The link you posted merely defines the zones you'd need to create in a Palo SD-WAN environment. Those zones based on their name have a specific use case based upon their name.
The question you are asking is directly addressed in the article under Existing Zones. The only thing you are mapping to SD-WANs predefined zones is for routing purposes, not for actual use within the security policies themselves. Which zone gets mapped to what predefined SD-WAN zone depends on your topography of your current deployment.
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