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IAM users, roles, policies

What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.

IAM users, roles, policies Root login for daily work and shared access keys are classic interview red flags. IAM controls who can do what in AWS. Users are people/services with long-lived creds; roles are assumable identities; policies are JSON Allow/Deny documents. Prefer IAM Identity Center or roles for humans; attach least-privilege policies; enable MFA on privileged users. An EC2 app reads S3
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What this card says

Why do we need it?

Root login for daily work and shared access keys are classic interview red flags.

What is it?

IAM controls who can do what in AWS. Users are people/services with long-lived creds; roles are assumable identities; policies are JSON Allow/Deny documents.

IAM

How to do it

Prefer IAM Identity Center or roles for humans; attach least-privilege policies; enable MFA on privileged users.

Example

An EC2 app reads S3 via an instance role — no access keys in the AMI.

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