De-Coupling Workflows

Question 1

Can SQS Queues be Bi-Directional

Answer 1

No, if you need communication to return to the instance that sent the message, you’ll need a second queue

Your web servers won’t be able to push info back the same way it would require a second queue pointed the other way

Question 2

Can SQS Duplicate Messages?

Answer 2

Yes,
This is only once in a while if you see if frequently check for a misconfigured visibility timeout, or the dev is failing to make the delete API call

Question 3

SQS Defaults (Look into this more)

Answer 3

Stuff here

Question 4

How long can messages be stored in an SQS queue

Answer 4

Messages can persist for 14 days & default value is 4

Question 5

Does the SQS Order Matter?

Answer 5

If message order is important, make sure to pick SQS FIFO

Question 6

Proactive Notifications

Answer 6

Proactive notifications = SNS

Anytime a question asks about email, text, or any type of push based notification think SNS

Question 7

Cloudwatch & SNS

Answer 7

Scenarios that talk about getting a notification from a cloudwatch alarm should immediately make you look for SNS in the answer

Question 8

API Gateway

Answer 8

Doesn’t require an in-depth understanding. You only need to know it acts as a secure front door for external communications coming into. Your environemnt

Supports WAF to prevent DDOS attacks