AWS Application Integration Services Flashcards

An e-commerce app must send each new order event to an inventory service, a billing service, and an analytics service, each processing at its own pace with buffering. Which architecture fits best?

Answer: An SNS topic with three subscribed SQS queues

The SNS-to-SQS fan-out pattern delivers a copy of each message to multiple queues so each consumer processes independently.

An SNS topic publishes all order events, but one SQS subscriber should only receive events where the attribute order_type equals "international". What is the simplest solution?

Answer: Add a subscription filter policy to that subscriber

SNS subscription filter policies let each subscriber receive only messages matching specified attributes or payload properties.

Which of the following is NOT a supported Amazon SNS subscription endpoint type?

Answer: Amazon DynamoDB table

SNS can deliver to SQS, Lambda, HTTP/S, email, SMS, mobile push, and Data Firehose, but not directly to a DynamoDB table.

An application must send messages through SNS and SQS whose payloads exceed the service size limit. What is the AWS-recommended approach?

Answer: Use the Extended Client Library to store payloads in Amazon S3 and send a reference

The SNS and SQS Extended Client Libraries store large payloads in S3 and pass a pointer in the message.

A mobile app team wants to send push notifications to iOS and Android devices without building their own integration with APNs and FCM. Which service should they use?

Answer: Amazon SNS mobile push

Amazon SNS mobile push sends notifications to platforms such as Apple APNs and Firebase Cloud Messaging.

An HTTPS endpoint subscribed to an SNS topic is occasionally unavailable. How can you control how SNS retries deliveries to it?

Answer: Configure a delivery policy with retry and backoff settings

SNS delivery policies define retry counts, delays, and backoff functions for HTTP/S endpoints.

A compliance requirement states that messages stored by an SNS topic must be encrypted at rest. What should you enable?

Answer: Server-side encryption with an AWS KMS key on the topic

SNS supports server-side encryption using AWS KMS keys to protect message contents at rest.