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

FIFO queues with content-based deduplication use a SHA-256 hash of the message body to prevent duplicate messages within a 5-minute deduplication interval.

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 SQS queue resource policy must grant the SNS service principal (sns.amazonaws.com) permission to send messages to the queue.

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

Within a FIFO queue, messages with the same MessageGroupId are delivered in order, and only one consumer processes messages from a given group at a time.

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

After the visibility timeout expires without deletion, SQS makes the message visible again so another consumer can attempt to process it.

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

SNS subscription filter policies allow each subscriber to receive only messages whose attributes match defined criteria, such as orderStatus = CANCELLED.

AWS Practice Test

AWS Practice Test

AWS Certified Solutions Architect Decoupling with SQS and SNS 2