1. What is AWS and why is it widely used?
Riya answered:
“AWS is the world's leading cloud platform that provides on-demand services like compute, storage, databases, and networking. It's widely used because it allows businesses to scale quickly without upfront hardware costs. Imagine a startup that suddenly gets 1M users overnight—AWS helps them scale instantly without buying servers.”
2. What are Regions and Availability Zones in AWS?
“Think of Regions as cities and Availability Zones as well-connected neighborhoods inside that city. If one neighborhood faces a power cut, others still work. That's how AWS ensures high availability.”
3. Explain the difference between EC2, S3, and Lambda.
“EC2 is like renting a computer, S3 is like a massive online storage drive, and Lambda is like hiring a worker who shows up only when needed. This pay-per-use model saves costs.”
4. What is Auto Scaling in AWS?
“Imagine running an e-commerce site during Diwali sales. Auto Scaling automatically adds servers when traffic spikes and reduces them when traffic falls, saving money while ensuring performance.”
5. What is IAM (Identity and Access Management)?
“IAM works like a security guard at the office entrance. It ensures only authorized people (users, roles, groups) access specific AWS resources. It's about permissions and safety.”
6. What is the difference between Load Balancer and API Gateway?
“A Load Balancer distributes traffic between multiple servers—like staff in a restaurant serving customers. API Gateway, on the other hand, manages and secures APIs—like a receptionist controlling who gets access inside the building.”
7. What are the types of AWS storage services?
“AWS offers S3 for object storage, EBS for block storage, and Glacier for long-term archive. Think of it like a laptop (EBS), a Dropbox account (S3), and a warehouse (Glacier).”
8. How does AWS ensure security?
“AWS follows the Shared Responsibility Model. AWS secures the cloud infrastructure (like data centers), while customers secure their applications and data inside the cloud—just like a landlord providing a safe house while you install your own locks.”
9. What is the difference between vertical and horizontal scaling in AWS?
“Vertical scaling means upgrading your existing server (like buying a bigger machine). Horizontal means adding more servers (like scaling hiring more workers). AWS supports both depending on workload.”
10. Explain Amazon VPC (Virtual Private Cloud).
“A VPC is like a private office inside a big corporate building (AWS). You control who enters, what data flows, and how secure it is.”
11. How does CloudFormation help in automation?
“Instead of manually setting up resources, CloudFormation is like a recipe card. You write the instructions once, and AWS automatically builds the infrastructure for you every time.”
12. Difference between RDS and DynamoDB?
"RDS is a relational database (like traditional Excel sheets with structured rows/columns). DynamoDB is a NoSQL database (like a flexible notebook that can store unstructured data)."
13. What is AWS CloudTrail?
“CloudTrail is like CCTV for AWS accounts. It records every action—who logged in, what changes were made—ensuring accountability and auditing.”
14. Explain the Shared Responsibility Model.
“AWS manages the physical cloud (data centers, hardware, networking), while you manage your applications, data, and configurations. It's like AWS being the landlord and you being the tenant.”
15. How do you optimize costs in AWS?
“By using Auto Scaling, Reserved Instances, spot instances, and monitoring unused resources. A real example: a company saved 40% by shutting down idle servers at night.” AWS INTERVIEW AND QUESTION AND
