Hi I'm struggling to understand of public vs private communication in Amazon VPC.

what if EC2 instance is not assigned public ipv4 in public subnet, can it get traffic/data from any other EC2 instances which is assigned public ipv4 in the same VPC, but in different subnets, Availability Zone by using private communication?

Could somebody can guide me to what differentiation of communication in public vs private in this situation?

Thanks in advance.

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