The AWS solutions architect certification shows that you can use AWS services to solve software engineering problems and understand core best practices of the industry. In this article, I will quiz you on two sections from the material required for the exam: SQS and SNS.
I will now briefly state some key facts about each AWS service and then provide some example questions for the exam.
N.B: The following information on its own will not be enough to answer the questions.
SQS
The Simple Queue Service is a fully managed queue service. It is key to building distributed and scalable systems by enabling services to be decoupled.
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SQS Visibility — source*
It is also useful to know:
Each messages on the queue have a globally unique Id.
Messages can have medata — process without processing all message.
The queue is accessible via a DNS name.
There is a maximum of 120,000 in flight messages on a single queue.
A queue can have multiple readers.
Delay queue is used to postpone delivery of new messages.
Visibility timeouts define how long a message is available once retrieved from queue: 12 hour max — 30 second default.
The API features long polling for message — 20 second max.
Dead letter queues are used for storing failed processing from another queue.
SNS
The Simple Notification Service is a fully managed messaging service. It can also be used to decouple systems but instead pushes messages to consumers without guarantee it has been read.
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SNS can be used to distribute messages to many other services — source*
It is also useful to know:
Messages are published to topics and subscribers of those topics will be sent the message.
Works with HTTP, HTTPS, SMS, email, email-JSON, Amazon SQS, and AWS Lambda.
The API features the ability to poll for messages.
The Fanout feature allows users to push messages to multiple subscribers.
Quiz 🎓
The quiz can also be accessed in full size here. These questions were sourced from multiple locations (mainly the certification sample test) over a long period of time.
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