Master AWS API Gateway: Key Interview Questions and Answers

I can provide you with the top 10 AWS API Gateway interview questions and answers:

  1. Q: What is AWS API Gateway? A: AWS API Gateway is a fully managed service that allows developers to create, publish, and manage APIs for their applications. It acts as a front door for applications to access backend services and provides features like authentication, authorization, and request/response transformations.

  2. Q: What are the benefits of using AWS API Gateway? A: Some benefits of using AWS API Gateway include:

    • Easy creation and management of APIs

    • Built-in security features like authentication and authorization

    • Integration with other AWS services

    • Scalability and high availability

    • Monitoring and logging capabilities

  3. Q: How can you integrate AWS API Gateway with Lambda functions? A: AWS API Gateway can be integrated with AWS Lambda functions by creating a Lambda function as the backend for an API endpoint. This allows the API Gateway to trigger the Lambda function whenever a request is made to the API endpoint.

  4. Q: What are the different types of APIs supported by AWS API Gateway? A: AWS API Gateway supports two types of APIs:

    • REST APIs: Representational State Transfer APIs that use HTTP methods like GET, POST, PUT, DELETE, etc., to perform operations on resources.

    • WebSocket APIs: APIs that allow real-time communication between clients and servers over a persistent connection.

  5. Q: How can you enable authentication and authorization for APIs in AWS API Gateway? A: AWS API Gateway provides several options for authentication and authorization, such as:

    • IAM (Identity and Access Management) roles and policies

    • Cognito User Pools for user management

    • Lambda authorizers for custom authentication logic

    • OAuth 2.0 providers like Amazon Cognito, Google, or Facebook

  6. Q: How can you handle API versioning in AWS API Gateway? A: API versioning in AWS API Gateway can be achieved by utilizing resource paths or custom headers. You can include version numbers in the resource paths or headers to differentiate between different versions of your APIs.

  7. Q: Can you explain the concept of API caching in AWS API Gateway? A: API caching in AWS API Gateway allows you to cache the responses from your backend services. It improves the performance and reduces the load on your backend by serving the cached responses to subsequent identical requests.

  8. Q: How can you monitor and log API usage in AWS API Gateway? A: AWS API Gateway provides CloudWatch Logs integration, which allows you to log API requests, responses, and error messages. You can also enable CloudWatch Metrics to monitor API usage, including request counts, latencies, and error rates.

  9. Q: What is the process to deploy an API in AWS API Gateway? A: To deploy an API in AWS API Gateway, you need to define the API configuration using the API Gateway service or through Infrastructure as Code (IaC) tools like AWS CloudFormation or Terraform. After defining the configuration, you can create a deployment to make the API accessible.

  10. Q: How can you secure your APIs in AWS API Gateway? A: To secure your APIs in AWS API Gateway, you can:

    • Use authentication and authorization mechanisms

    • Enable SSL/TLS encryption for API endpoints

    • Implement throttling and rate limiting to prevent abuse

    • Utilize AWS WAF (Web Application Firewall) for additional protection against common web exploits

Remember, these answers should serve as a starting point. It's always a good idea to dive deeper into each topic and provide specific examples from your own experience during an interview

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