SNS

Question 1

What message formats is supported?

Answer 1

• SMS text message
• Email
• SQS queues
• (any) HTTP endpoint
• (pushing directly to mobile devices)

Question 2

How can an SNS notification trigger a Lambda function?

Answer 2

The Lambda function subscribes to an SNS topic, and when a message is published to that topic the Lambda function is invoked with the payload of the published message.

Question 3

Can a single SNS topic can have subscribers that requires differently formatted messages subscribing to it?

Answer 3

Yes. When you publish to a topic, SNS delivers appropriately formatted copies of your message to each subscriber.

Question 4

What mechanism is used to prevent messages published to SNS from being lost?

Answer 4

The messages are stored redundantly across multiple availability zones.

Question 5

With SNS you have a pay-as-you-go model without any up-front costs.

Answer 5

Yes.