AWS Interview Questions and Answers
By Karthick Selvam · Published
Common AWS interview questions with concise answers.
What is a VPC?
A logically isolated virtual network in AWS where you define subnets, routing and security controls.
Security group vs NACL?
Security groups are stateful and attached to resources; network ACLs are stateless and apply at subnet level.
S3 storage classes?
Options like Standard, Intelligent-Tiering, Standard-IA and Glacier tiers trade access speed for cost.
What is an IAM role?
An identity with permissions that can be assumed temporarily by users, services or applications.
How do you make an application highly available?
Deploy across multiple Availability Zones with load balancing, auto scaling and managed databases with replication.
What is the shared responsibility model?
AWS secures the cloud infrastructure; customers secure what they put in it.
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