SNS - Simple Notification Service

Question 1

What is SNS?

Answer 1

Web service for sending notifications in the cloud

Allows you to publish messages from an application and deliver them to subscribers or applications

easy to use, pay as you go, no management

Question 2

What is pub-sub?

Answer 2

SNS follows publish-subscribe method, “pushing” messages to clients

No need for polling

Question 3

Compare SNS to SQS

Answer 3

SNS pushes messages

SQS clients pulls messages

Question 4

What can SNS deliver messages to?

Answer 4

mobile, SMS, email, SQS, any HTTP endpoint

Question 5

How does SNS prevent messages from being lost?

Answer 5

stores all messages redundantly across multiple AZ’s

Question 6

What is an SNS Topic?

Answer 6

A way of grouping multiple recipient.

an “access point” for allowing recipients to subscribe to identical copies of the same information

One topic can deliver to multiple endpoint types like iOS, Android and SMS

Publish once to a topic, and SNS correctly formats message for each type of recipient

Question 7

SNS Benefits

Answer 7

push based

easy integrations

flexible delivery over multiple protocols

cheap, pay as you go, no up front costs

AWS Console simplicity

Question 8

SNS pricing

Answer 8

$2 per 100,000 notifications over email

75 cents per 100 SMS notifications

6 cents per 100,000 notifications over HTTP

50 cents per million SNS requests

Question 9

SNS Data type

Answer 9

JSON