IAM vs Resource Policies

• Using AssumeRole, original permissions have to give up
• Lets say, I have permission to access DynamoDB`
• Using AssumeRole I got access of S3
• When I am using this AssumeRole, I can only access S3, but can not access DynamoDB
• But using Resource Policies we can use both S3 and DynamoDB
• Resource Based Policies are provided by
• S3
• SNS
• SQS