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Answering my own question here....From the following doc: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/data-protection.html
See "Encryption between instances" section..
"The instances are in the same VPC or peered VPCs, and the traffic does not pass through a virtual network device or service, such as a load balancer or a transit gateway."
Hello,
See below from the documentation
Using Nitro instances:
By default, traffic is automatically encrypted between the following Nitro instance types: C5n, G4, I3en, M5dn, M5n, P3dn, R5dn, and R5n. Traffic isn't encrypted when it's routed through a transit gateway, load balancer, or similar intermediary.
The same link talks about what are some of the ways to achieve encryption in transit for various scenarios.
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