Amazon API Gateway Interview Questions and Answers for internship

0
Amazon API Gateway Internship Interview Questions & Answers

  1. What is Amazon API Gateway?

    • Answer: Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. It acts as a front door for applications to access back-end services, handling tasks like authentication, authorization, request throttling, and monitoring.

  2. Explain the different API Gateway deployment stages.

    • Answer: API Gateway supports different deployment stages (e.g., dev, test, prod) allowing developers to deploy API versions to separate environments for testing and gradual rollouts. This ensures a smooth transition to production and minimizes disruption.

  3. What are REST APIs and how do they relate to API Gateway?

    • Answer: REST (Representational State Transfer) APIs are a architectural style for building web services. API Gateway excels at managing and deploying REST APIs, handling the complexities of routing requests, managing authentication, and scaling resources.

  4. Describe the concept of API Gateway REST API integrations.

    • Answer: API Gateway integrates with various back-end services, like AWS Lambda, HTTP endpoints, or other AWS services. Integrations define how API Gateway routes requests to the appropriate backend based on the API definition.

  5. How does API Gateway handle authentication and authorization?

    • Answer: API Gateway offers several authentication methods like AWS IAM, Amazon Cognito, custom authorizers (Lambda functions), and OAuth 2.0. Authorization is managed through request validators, IAM roles, and custom authorization logic within authorizers.

  6. What are API Gateway request validators?

    • Answer: Request validators allow you to define rules to ensure incoming requests conform to a specific structure and data type. This helps validate data before it reaches the backend, enhancing security and data integrity.

  7. Explain the role of API Gateway throttling and quotas.

    • Answer: Throttling and quotas prevent API overuse and ensure fair resource allocation. API Gateway allows you to configure request rate limits and burst limits to protect your backend from overload.

  8. How does API Gateway handle caching?

    • Answer: API Gateway can cache responses from backend integrations, reducing latency and improving performance. This is especially useful for frequently accessed data that doesn't change often.

  9. What are custom authorizers in API Gateway?

    • Answer: Custom authorizers are Lambda functions that implement custom authentication and authorization logic. They allow for greater flexibility beyond built-in authentication methods.

  10. How do you monitor API Gateway performance?

    • Answer: API Gateway integrates with Amazon CloudWatch, providing metrics on request latency, error rates, throughput, and other key performance indicators. CloudWatch dashboards and alarms allow for real-time monitoring and alerting.

  11. Explain API Gateway's role in serverless architectures.

    • Answer: API Gateway is a crucial component of serverless architectures. It acts as the entry point, routing requests to Lambda functions or other serverless components without managing servers.

  12. What are some best practices for designing APIs using API Gateway?

    • Answer: Best practices include using RESTful design principles, implementing proper error handling, using versioning for backward compatibility, employing security best practices (authentication and authorization), and monitoring performance regularly.

  13. How can you deploy an API to different environments using API Gateway?

    • Answer: Use different deployment stages (dev, test, prod) to deploy the same API to different environments. This allows for independent testing and deployment without affecting other environments.

  14. Explain the difference between an API and a microservice.

    • Answer: An API is an interface that allows different systems to communicate. A microservice is a small, independent service that performs a specific function. API Gateway can manage APIs that access microservices.

Thank you for reading our blog post on 'Amazon API Gateway Interview Questions and Answers for internship'.We hope you found it informative and useful.Stay tuned for more insightful content!