Thank you for reaching out on the Microsoft Q&A forum.
If I understand it correctly you want to explore high level Network infrastructure designs in Azure.
I think it will helpful if you can go through the Networking Fundamental documentation for Azure. You can explore different architectures possible in Azure via this Architecture Guide and Networking Best Practices.
You can also go through this guide on designing highly available NVAs.
Azure architecture center for Networking is also a good resource that you can explore.
Hope this helps!
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