Service Communication

Question 1

What is the maximum Step Function execution time?

Answer 1

1 year

Question 2

True or False: You can add manual approvation steps to Step Function executions

Answer 2

True

Question 3

What are the types of AWS Step Functions Workflows

Answer 3

Standard Workflows and Express Workflows

Question 4

Describe the differences between Step Functions Workflow types regarding:
-Maximum duration
-Maximum execution start and state transition rate
-Pricing
-Execution Semantics

Answer 4

-Standard max duration is 1 year, while for express it’s 5 minutes
-Standard start and transition rates are 2.000/s and 4.000/s, while Express are 100.000/s and almost unlimited
-Standard is priced per state transition, while express is priced by their number, duration and memory consumption
-Standard is executed exactly-once, Express is executed at-least-once

Question 5

True or False: there is no assynchronous execution configuration on AWS Step Functions

Answer 5

False

Question 6

What is the max size message accepted by SQS?

Answer 6

256 KB

Question 7

How many messages per second can you send to a FIFO SQS queue?

Answer 7

300/s without batching, 3.000/s with batching

Question 8

True or False: The DLQ of a FIFO Queue must be a FIFO Queue and the DLQ of a Standard Queue must be a Standard Queue

Answer 8

True

Question 9

When processing SQS messages, there is no guarantee a message will not be processed twice in case of error. What is a strategy to deal with this?

Answer 9

Structure your achitecture in such a way that there are no problems even if a message is processed twice.

Question 10

What is Amazon MQ?

Answer 10

It is a managed message broker service for RabbitMQ and ActiveMQ

Question 11

What is the expected use case of Amazon MQ?

Answer 11

Replatforms where you already use RabbitMQ or ActiveMQ on your original architecture and don’t want to change to SQS / SNS

Question 12

True or False: Amazon MQ can only perform queue features or topic features, not both

Answer 12

False

Question 13

True or False: Amazon MQ cannot be configured as Multi-AZ

Answer 13

False

Question 14

How many topics and subscriptions per topic can SNS support?

Answer 14

-Topics: 100.000
-Subscriptions per topic: 12.500.000

Question 15

Complete the following statement:
SNS has in-transit encryption using ______ and at-rest encryption using ________

Answer 15

-HTTPS
-KMS keys

Question 16

For which use case is the fan-out SNS pattern useful?

Answer 16

If you have multiple SQS Queues receiving messages from the same place

Question 17

Describe the Fan-Out SNS pattern

Answer 17

One SNS topic has subscriptions to multiple SQS Queues, Lambda Function triggers, etc

Question 18

Whats one example of the SNS Fan-Out using S3?

Answer 18

Sending S3 events to multiple SQS queues or Lambda functions

Question 19

True or False: SNS, like SQS, has a FIFO functionality, but only SQS FIFO Queues can subscribe to them

Answer 19

False, any SQS Queue can subscribe to FIFO SNS Topics

Question 20

True or False: A FIFO SNS Topic has the same thoroughput as an SQS FIFO Queue

Answer 20

True

Question 21

True or False: It is possible to filter the messages sent to subscriptions of an SNS topic, meaning not all subcriptions get all messages

Answer 21

True

Question 22

True or False: You can setup SQS DLQs for failed SNS Messages

Answer 22

True