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What are the three main cloud service models? Give an AWS example for each.
Tip: IaaS: raw compute/storage/network (EC2, S3). PaaS: managed runtime/framework (Elastic Beanstalk, RDS). SaaS: complete software (Gmail, Salesforce). Most cloud engineering work is at the IaaS/PaaS boundary.
What is an AWS VPC? What does it provide that a default public setup does not?
Tip: A VPC is a logically isolated virtual network. You define IP ranges, subnets (public vs private), routing tables, and security groups. Private subnets have no direct internet access — databases and app servers should live there.
Explain AWS IAM. What is the difference between a role, a policy, a user, and a group?
Tip: Policy: JSON permission document. User: human identity. Group: collection of users sharing policies. Role: assumable identity (by a service, Lambda, EC2 instance profile) with no long-term credentials. Follow principle of least privilege for all.
What is the difference between AWS S3 and EBS? When would you use each?
Tip: S3: object storage, HTTP accessible, unlimited scale, not mountable. EBS: block storage, mountable as a disk, attached to a single EC2 instance, low-latency reads. Use S3 for static assets/backups, EBS for OS disks and databases.
How does AWS auto-scaling work? What metrics can trigger scale-out?
Tip: Auto Scaling Groups monitor CloudWatch metrics and launch/terminate EC2 instances based on policies. Triggers: CPU utilisation (most common), SQS queue depth, custom metrics. Define min/max/desired capacity. Pair with ALB for traffic distribution.
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