AWS Interview Questions – Introduction
1. [Asked in Infosys] What is AWS?
Answer:
AWS (Amazon Web Services) is a cloud computing platform provided by Amazon. It offers a wide range of cloud services such as computing power, storage, databases, networking, AI/ML, and security, allowing businesses to build and scale applications efficiently.
2. [Asked in TCS] What are the key benefits of using AWS?
Answer:
AWS provides several advantages:
- Scalability – Easily scale resources up or down based on demand.
- Cost-effectiveness – Pay only for what you use with no upfront costs.
- High Availability – Ensures redundancy with multiple data centers.
- Security – Provides strong security features like IAM, encryption, and compliance tools.
- Global Reach – AWS operates in multiple geographic regions worldwide.
3. [Asked in Cognizant] What are the core components of AWS?
Answer:
AWS has a wide range of services categorized into:
- Compute – EC2, Lambda, ECS
- Storage – S3, EBS, Glacier
- Databases – RDS, DynamoDB, Aurora
- Networking – VPC, Route 53, CloudFront
- Security & IAM – AWS IAM, KMS, Shield
4. [Asked in Wipro] What is an AWS Region and Availability Zone?
Answer:
AWS Regions are geographical locations where AWS has data centers (e.g., us-east-1, ap-south-1).
Each region has multiple Availability Zones (AZs), which are isolated data centers within a region to ensure high availability and disaster recovery.
Example: us-east-1 has 6 AZs (us-east-1a, us-east-1b, etc.).
5. [Asked in IBM] What are AWS Compute Services?
Answer:
AWS Compute services provide scalable computing power in the cloud. Some key compute services are:
- EC2 (Elastic Compute Cloud): Virtual servers for hosting applications.
- Lambda: Serverless compute function that runs code on demand.
- ECS (Elastic Container Service): Manages and scales containerized applications.
- EKS (Elastic Kubernetes Service): Fully managed Kubernetes service.
6. [Asked in Deloitte] What is Amazon S3, and why is it used?
Answer:
Amazon S3 (Simple Storage Service) is an object storage service that allows storing and retrieving large amounts of data securely and cost-effectively.
- Key Features: Unlimited storage, versioning, lifecycle policies, and security.
- Use Cases: Data backup, website hosting, big data analytics.
Example: A website storing user-uploaded images in an S3 bucket.
7. [Asked in Amazon] How does AWS ensure security in the cloud?
Answer:
AWS follows the Shared Responsibility Model, where:
- AWS is responsible for securing the infrastructure (data centers, networking).
- Customers are responsible for securing their applications and data (IAM policies, encryption).
AWS security services include IAM (Identity & Access Management), AWS WAF (Web Application Firewall), AWS Shield (DDoS protection), and AWS KMS (Key Management Service).
8. [Asked in Microsoft] What is AWS Lambda?
Answer:
AWS Lambda is a serverless compute service that allows running code without provisioning servers.
- Pay-as-you-go pricing (billed for execution time).
- Automatically scales based on workload.
- Supports multiple languages (Python, Node.js, Java, Go, C#).
Example: Triggering a Lambda function when an image is uploaded to S3.
9. [Asked in Google] What is the difference between AWS EC2 and AWS Lambda?
Answer:
| Feature | AWS EC2 | AWS Lambda |
|---|---|---|
| Server management | Requires manual provisioning | Fully managed (serverless) |
| Pricing model | Pay for instance uptime | Pay per execution |
| Scaling | Manual or auto-scaling | Automatic |
| Best for | Long-running applications | Event-driven applications |
10. [Asked in Flipkart] What is the AWS Free Tier?
Answer:
AWS Free Tier allows new users to try AWS services for free for 12 months with certain usage limits.
- EC2: 750 hours/month (t2.micro instance).
- S3: 5 GB free storage.
- Lambda: 1 million requests per month.
The Free Tier helps users explore AWS without incurring costs.
