AWS Associate Certified Developer - Associate 2

Question 1

A developer needs to ensure messages in an SQS queue are processed exactly once. Which SQS feature should they use?

Accepted Answer

FIFO Queue with content-based deduplication

Answer

FIFO queues with content-based deduplication use a SHA-256 hash of the message body to prevent duplicate processing.

Question 2

An application uses AWS Cognito for authentication. After a user signs in, which token is used to authorize API Gateway calls?

Accepted Answer

Access token

Answer

The access token contains scopes and groups and is used to authorize API calls, while the ID token contains user identity claims.

Question 3

A Lambda function must read configuration values that change infrequently. What is the MOST cost-effective approach?

Accepted Answer

Store values in environment variables

Answer

Environment variables are loaded at container initialization, avoiding per-invocation API calls and associated latency/cost.

Question 4

A developer is using the AWS SDK and receives a ThrottlingException. What retry strategy should be implemented?

Accepted Answer

Retry with exponential backoff and jitter

Answer

Exponential backoff with jitter reduces contention by spacing retries and randomizing intervals to avoid synchronized retry storms.

Question 5

Which DynamoDB feature allows a developer to read data with the lowest latency, accepting potentially stale data?

Accepted Answer

Eventually consistent reads

Answer

Eventually consistent reads use half the read capacity units of strongly consistent reads and may return slightly stale data.

AWS Practice Test