AWS Certified Solutions Architect Decoupling with SQS and SNS 2

Question 1

A company wants to ensure that messages in an SQS queue are not processed more than once. Which SQS queue type and feature should be used?

Accepted Answer

FIFO queue with content-based deduplication enabled

Answer

Standard queue with message deduplication ID

Answer

Standard queue with visibility timeout set to 0

Answer

FIFO queue with long polling enabled

Question 2

An SNS topic is configured to deliver messages to an SQS queue. The SQS queue policy must allow which principal to send messages?

Accepted Answer

The SNS service (sns.amazonaws.com)

Answer

The IAM user who created the SNS topic

Answer

The AWS account root user

Answer

The Lambda function subscribed to the topic

Question 3

A solutions architect needs messages to be delivered in strict order to multiple SQS consumers. Which combination achieves this?

Accepted Answer

FIFO SQS queue with a single consumer group per message group ID

Answer

Standard SQS queue with multiple consumers using long polling

Answer

Standard SQS queue with a DLQ for ordering failures

Answer

FIFO SQS queue with content-based deduplication and multiple consumers reading the same message group

Question 4

What happens to an SQS message when a consumer receives it but does not delete it before the visibility timeout expires?

Accepted Answer

The message becomes visible again and can be received by another consumer

Answer

The message is permanently deleted from the queue

Answer

The message is moved to the dead-letter queue automatically

Answer

The message is archived in S3 for later processing

Question 5

A company uses SNS fan-out to deliver order events to multiple SQS queues. One downstream team needs to receive only 'CANCELLED' order events. What is the correct approach?

Accepted Answer

Apply an SNS subscription filter policy on the team's SQS subscription

Answer

Create a separate SNS topic exclusively for cancellations

Answer

Use SQS message filtering on the receiving queue

Answer

Configure CloudWatch Events to route messages by attribute

Question 6

What is the maximum message size supported by Amazon SQS?

Accepted Answer

256 KB

Answer

64 KB

Answer

1 MB

Answer

10 MB

Question 7

Which SQS feature allows a consumer to retrieve up to 10 messages in a single API call, reducing the number of empty responses when the queue is sparse?

Accepted Answer

Long polling with WaitTimeSeconds up to 20

Answer

Short polling with WaitTimeSeconds=0

Answer

Batch receive with MaxNumberOfMessages=10

Answer

Dead-letter queue redrive policy