AWS Serverless Architecture and AWS Lambda 2 — Questions and Answers
Question 1: Which AWS service is most commonly used to expose Lambda functions as RESTful HTTP endpoints?
- AWS AppSync
- Amazon API Gateway (Correct answer)
- Elastic Load Balancing
- Amazon Route 53
Correct answer: Amazon API Gateway
Amazon API Gateway is a fully managed service for creating, deploying, and managing REST, HTTP, and WebSocket APIs that can invoke Lambda functions.
Question 2: What is the primary purpose of AWS Step Functions in a serverless architecture?
- Managing serverless database connection pooling
- Orchestrating multiple Lambda functions and AWS services into visual workflows (Correct answer)
- Monitoring and alerting on Lambda performance metrics
- Compressing and optimizing Lambda deployment packages
Correct answer: Orchestrating multiple Lambda functions and AWS services into visual workflows
AWS Step Functions orchestrates multiple Lambda functions and AWS services into coordinated workflows using state machines.
Question 3: Which Amazon DynamoDB feature automatically deletes table items after a developer-defined expiration timestamp?
- DynamoDB Streams
- DynamoDB Global Tables
- DynamoDB Time to Live (TTL) (Correct answer)
- DynamoDB Auto Scaling
Correct answer: DynamoDB Time to Live (TTL)
DynamoDB TTL lets you set a per-item expiration attribute; DynamoDB automatically deletes expired items within 48 hours at no extra cost.
Question 4: In Amazon API Gateway, what does a 'stage' represent?
- An IAM permission boundary for API callers
- A named snapshot of a deployment used to separate environments such as dev, test, and prod (Correct answer)
- A VPC endpoint configuration for private API access
- A response caching policy applied to all API methods
Correct answer: A named snapshot of a deployment used to separate environments such as dev, test, and prod
An API Gateway stage is a named reference to a deployment, enabling separate configurations and URLs for different environments like development and production.
Question 5: Which AWS service provides a fully managed serverless GraphQL API?
- Amazon API Gateway
- AWS AppSync (Correct answer)
- Amazon CloudFront
- AWS Lambda
Correct answer: AWS AppSync
AWS AppSync is a fully managed GraphQL service that connects to data sources like DynamoDB and Lambda and supports real-time subscriptions.
Question 6: What is the purpose of Lambda Destinations for asynchronous invocations?
- To configure VPC subnets where Lambda functions execute
- To automatically route the result of an async invocation to another AWS service on success or failure (Correct answer)
- To specify the S3 bucket used for uploading deployment packages
- To define the IAM execution role attached to a Lambda function
Correct answer: To automatically route the result of an async invocation to another AWS service on success or failure
Lambda Destinations send the result of an asynchronous function invocation to a target like SQS, SNS, EventBridge, or another Lambda based on success or failure outcome.
Question 7: Which AWS service acts as a central serverless event bus for routing events between AWS services, custom applications, and SaaS providers?
- Amazon SQS
- Amazon SNS
- Amazon EventBridge (Correct answer)
- AWS CloudTrail
Correct answer: Amazon EventBridge
Amazon EventBridge is a serverless event bus that routes events from AWS services, custom apps, and SaaS partners to targets like Lambda based on rules.
AWS Serverless Architecture and AWS Lambda 2
Which AWS service is most commonly used to expose Lambda functions as RESTful HTTP endpoints?