Wrt, "I want to understand the Data Transfer within the same AZ is free within a VNET or across VNETs as well?"
- As long as the source and destination is in same Availability Zone, Data transfer within is free in both the cases
For Data Transfer charges in different Availability Zones within same region, see Intra-continental Data Transfer
Kindly let us know if this helps or you need further assistance on this issue.
Thanks,
Kapil
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