Day 49 - Interview Questions on AWS

Hey everyone! 👋
We’ve heard your feedback and are excited to include interview-based questions as part of our daily tasks. Here's a curated list of AWS interview questions to sharpen your skills. Let’s dive in! 🚀

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INTERVIEW QUESTIONS

1. Name 5 AWS services you have used and their use cases

• Amazon EC2: For hosting virtual servers to run applications.

• Amazon S3: For scalable object storage and static website hosting.

• AWS Lambda: For running serverless applications without managing servers.

• Amazon RDS: For managing relational databases like MySQL/PostgreSQL.

• AWS CloudFront: For speeding up content delivery through a CDN.

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2. What are the tools used to send logs to the cloud environment?

• AWS CloudWatch: Monitors and stores logs for analysis.

• AWS Kinesis: Streams real-time logs and event data.

• Fluentd: Open-source tool for collecting, processing, and transporting logs.

• Logstash: For log ingestion and processing before sending to AWS services.

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3. What are IAM Roles? How do you create/manage them?

• Definition: IAM Roles provide temporary access permissions to AWS services.

• How to Create:

  1. Go to IAM Console → Roles.

  2. Choose a trusted entity (e.g., AWS service).

  3. Attach a policy defining permissions.

• Management: Regularly review attached policies and rotate credentials.

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4. How to upgrade or downgrade a system with zero downtime?

• Steps:

  1. Use Auto Scaling Groups for horizontal scaling.

  2. Leverage a blue/green deployment strategy.

  3. Configure Load Balancers to route traffic between environments.

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5. What is Infrastructure as Code (IaC), and how do you use it?

• Definition: IaC automates infrastructure setup using code (e.g., YAML, JSON).

• Tools:

  • AWS CloudFormation: For creating and managing AWS resources.

  • Terraform: For multi-cloud IaC automation.

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6. What is a Load Balancer? Give scenarios of each kind.

• Definition: Distributes traffic evenly to multiple instances.

• Types:

  • Application Load Balancer: For HTTP/HTTPS traffic (e.g., web apps).

  • Network Load Balancer: For TCP/UDP traffic (e.g., real-time gaming).

  • Classic Load Balancer: Legacy option for basic load balancing.

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7. What is AWS CloudFormation, and why is it used?

• Definition: Automates the provisioning of AWS resources using templates.

• Why Use It?:

  • Simplifies infrastructure management.

  • Ensures repeatability and consistency across deployments.

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8. Difference between AWS CloudFormation and AWS Elastic Beanstalk

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9. What are the kinds of security attacks that can occur on the cloud? How can we minimize them?

• Attacks:

  • DDoS Attacks

  • Data Breaches

  • Malware Injections

  • Man-in-the-Middle (MITM) Attacks

• Minimization Strategies:

  • Enable AWS Shield for DDoS protection.

  • Use IAM Policies for least privilege access.

  • Encrypt data with AWS KMS.

  • Regularly monitor with AWS GuardDuty.

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10. Can we recover an EC2 instance if we have lost the key?

• Yes! Steps:

  1. Stop the instance.

  2. Detach its root volume.

  3. Attach it to another instance.

  4. Add a new key to the authorized_keys file.

  5. Reattach the volume and restart the instance.

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11. What is a Gateway?

• Definition: Connects internal resources to external networks.

• Types:

  • Internet Gateway: For VPC internet access.

  • NAT Gateway: For outbound traffic without exposing instances.

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12. What is the difference between Amazon RDS, DynamoDB, and Redshift?

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13. Do you prefer to host a website on S3? Why or why not?

• Yes: Ideal for static websites because:

  • Highly scalable and cost-effective.

  • Built-in integration with CloudFront for CDN.

• No: Not suitable for dynamic content or server-side processing.

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That’s it for Day 49! Keep practicing these questions to boost your AWS interview preparation. Have more suggestions? Let us know in the comments! 😊