AWS Certified Developer Associate
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Free AWS Certified Developer Associate Questions
A developer implements SAM applications requiring nested stacks for modular architecture. What SAM feature enables nested stacks?
- A) Single template only
- B) AWS::Serverless::Application resource referencing nested SAM templates
- C) No nesting capability
- D) Multiple separate stacks manually
Explanation
SAM nested applications: AWS::Serverless::Application resource references nested SAM template (local file or S3/Serverless Application Repository). Parent template passes parameters to nested template. Nested stack creates resources independently. Use for: microservices, shared resources, modular architecture, reusable components. sam package uploads nested templates to S3. Outputs from nested stack accessible in parent. Alternative: CloudFormation nested stacks with AWS::CloudFormation::Stack.
A developer must implement content-based routing in API Gateway sending requests to different backends based on request attributes. What feature enables this?
- A) Single backend only
- B) Not possible
- C) Manual routing in Lambda
- D) API Gateway request/response transformations with method integration conditions
Explanation
API Gateway doesn't natively support content-based routing. Implement via Lambda integration: Lambda examines request body/headers, routes to appropriate backend (invoke other Lambda, call HTTP endpoint, access different resource). Alternative: use method integrations with mapping templates transforming requests differently. Request validators ensure proper format. Lambda provides maximum routing flexibility.
Correct Answer
D) API Gateway request/response transformations with method integration conditions
A Lambda function must access a database connection string stored securely with encryption. What service should store this value?
- A) Environment variables in plaintext
- B) Hardcoded in function code
- C) Systems Manager Parameter Store SecureString with KMS encryption
- D) S3 object with public access
Explanation
Parameter Store SecureString encrypts parameters using KMS keys. Store connection string as SecureString. Lambda retrieves via GetParameter API with WithDecryption=true. IAM execution role needs ssm:GetParameter and kms:Decrypt permissions. Free for standard parameters. Supports version tracking. Environment variables can be encrypted but Parameter Store provides centralized management. Never hardcode credentials.
Correct Answer
C) Systems Manager Parameter Store SecureString with KMS encryption
An application must query DynamoDB using a non-primary-key attribute efficiently. What DynamoDB feature enables this?
- A) Scan operation on entire table
- B) Multiple Query operations
- C) Global Secondary Index (GSI) on the attribute
- D) Manual filtering of all items
Explanation
Global Secondary Index (GSI) allows queries on non-primary-key attributes. GSI has its own partition and sort keys different from base table. Queries against GSI efficiently like primary key queries. Can project a subset of attributes to GSI reducing storage. LSI (Local Secondary Index) shares a partition key with the base table. Scan reads the entire table (inefficient, expensive). GSI enables efficient access patterns.
Correct Answer
C) Global Secondary Index (GSI) on the attribute
An application running in Lambda needs temporary AWS credentials to access S3. What is the most secure approach?
- A) Hardcode IAM user access keys in code
- B) Store credentials in environment variables
- C) IAM role attached to Lambda function (execution role)
- D) Pass credentials as function parameters
Explanation
Lambda execution role (IAM role) provides temporary credentials automatically via AWS STS. Lambda assumes the role; credentials available through AWS SDK without explicit configuration. Credentials rotate automatically. Grant least privilege permissions in role policy. Hardcoded keys create security risk (leaked in code). Environment variables expose credentials. Parameter passing requires credential management.
Correct Answer
C) IAM role attached to Lambda function (execution role)
An application needs to store user session data with fast read/write access and automatic expiration after 30 minutes of inactivity. What AWS service fits best?
- A) RDS with manual cleanup
- B) S3 with lifecycle policies
- C) DynamoDB with streams
- D) DynamoDB with TTL (Time To Live) attribute
Explanation
DynamoDB with TTL provides automatic item deletion based on timestamp attribute. Store session data with TTL set to current_time + 1800 seconds. DynamoDB automatically deletes expired items within 48 hours (typically sooner). Single-digit millisecond latency for reads/writes. No manual cleanup required. RDS requires scheduled jobs for cleanup. S3 lifecycle minimum is 1 day. DynamoDB Streams is for change data capture, not expiration.
Correct Answer
D) DynamoDB with TTL (Time To Live) attribute
An application must handle SQS messages in order within specific groups but allow parallel processing across groups. What configuration enables this?
- A) FIFO queue with MessageGroupId for ordered processing per group
- B) Standard queue
- C) Single consumer for all messages
- D) Multiple standard queues
Explanation
FIFO queue with MessageGroupId partitions messages into ordered groups. Messages within same group processed sequentially (FIFO order). Different groups processed in parallel enabling concurrency. Example: orders per customer (group by customer_id) process in order per customer but multiple customers processed simultaneously. Throughput: 300 messages/second per group (3,000 with batching).
Correct Answer
A) FIFO queue with MessageGroupId for ordered processing per group
A developer needs to implement pessimistic locking in DynamoDB preventing concurrent modifications. What pattern implements locks?
- A) No locking support
- B) Lease-based locking with conditional writes and expiration timestamp
- C) Optimistic locking only
- D) Read-only access
Explanation
Pessimistic lock pattern:
(1) acquire lock via PutItem with condition_expression attribute_not_exists(lock), include owner_id, expiration timestamp,
(2) process while holding lock,
(3) release lock via DeleteItem with condition_expression owner_id = :expected_owner,
(4) automatic expiration via application-level timeout checking or TTL.
Prevents concurrent access.
Risk: deadlocks, orphaned locks (handle with timeouts).
Correct Answer Is:
B) Lease-based locking with conditional writes and expiration timestamp
A developer must implement pagination for API returning large result sets. What DynamoDB feature supports pagination?
- A) Return all items in single response
- B) DynamoDB Query/Scan with LastEvaluatedKey for pagination
- C) Client-side filtering only
- D) Multiple Query operations manually
Explanation
DynamoDB Query/Scan returns up to 1 MB of data per call. If more data exists, response includes LastEvaluatedKey. Pass as ExclusiveStartKey in next request to continue from where previous left off. Repeat until LastEvaluatedKey not present. Limit parameter controls items examined. Implement cursor-based pagination in API returning cursor to clients. Page size configurable.
Correct Answer
B) DynamoDB Query/Scan with LastEvaluatedKey for pagination
An application uses Lambda with API Gateway and needs CORS support for browser clients. What configuration enables CORS?
- A) CORS automatic
- B) Backend handles only
- C) No CORS support
- D) Enable CORS in API Gateway (OPTIONS method, headers) and return CORS headers from Lambda
Explanation
API Gateway CORS: (1) enable CORS in API Gateway console (adds OPTIONS method), (2) configure Access-Control-Allow-Origin (domains), Access-Control-Allow-Methods (GET, POST, etc.), Access-Control-Allow-Headers (Content-Type, Authorization), (3) Lambda returns same CORS headers in response for actual requests. Browser sends preflight OPTIONS before POST/PUT/DELETE. API Gateway responds to preflight. Lambda responses include headers. Proxy integration requires Lambda to return headers. Use * for all origins or specific domains.
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