Messaging and Integration Services

Question 1

coupling

Answer 1

defines the interdependencies or connections between components of a system

Question 2

loose coupling

Answer 2

helps reduce the risk of cascading failures between components

Question 3

example of tight coupling

Answer 3

monolithic app

Question 4

example of loose coupling

Answer 4

microservices architecture

Question 5

what are queues used for?

Answer 5

to implement loosely-coupled systems

Question 6

queue

Answer 6

a data structure that holds requests or messages

Question 7

FIFO

Answer 7

first in first out

Question 8

Simple Queue Service (SQS)

Answer 8

a message queueing service that allows you to build loosely coupled systems

• component-to-component messaging
• multiple components (producers) can add messages to the queue
• messages are processed asynchronously

Question 9

asynchronous

Answer 9

you don’t wait for the response, just let the user go on their way

Question 10

Example of using SQS

Answer 10

building a money transfer app that performs well under heavy load

Question 11

what can messaging queues do?

Answer 11

help improve performance and scalability

Question 12

Simple Notification Service (SNS)

Answer 12

allows you to send plain text emails and text messages from your applications
- works with CloudWatch when an alarm’s metric threshold is breached

Question 13

Example of SNS

Answer 13

send an email when CUP utilization of an EC2 instances goes above 80%

Question 14

Simple Email Service (SES)

Answer 14

Email service for sending HTML emails from your applications

- provides insights into click-thru and open rates for email marketing campaigns