Simple Notification Service (SNS) / Simple Queue Service (SQS)

Question 1

• Amazon SNS supports encrypted topics. When you publish messages to encrypted topics Amazon SNS uses “…this service…” to encrypt your messages

Answer 1

Customer master keys (CMK), powered by AWS KMS

Question 2

True or False, with SNS the subscriber decides what format they get the message in

Answer 2

True

Question 3

In SNS, What are some common endpoints for subscriptions?

Answer 3

• “HTTPs and HTTPs”: create webhooks into your web-application
• “Email”: good for internal email notifications (only supports plain text)
• “Amazon SQS”: place SNS message into SQS queue
• “Email-JSON”: sends you json via email
• “AWS Lambda”: triggers a lambda function
• “SMS”: send a text message
• “Platform application endpoints”: Mobile Push

Question 4

How many topics can each subscription subscribe to?

Answer 4

1

Question 5

Sending push notifications directly to apps on mobile devices is known as what

Answer 5

Application As Subscriber

Question 6

This is a fully managed pub/sub messaging service

Answer 6

Simple Notification Service (SNS)

Question 7

Publishers use the AWS API via ___ or ___ to push messages to a topic. Many AWS services integrate with SNS and act as publishers.

Answer 7

AWS CLI or SDK

Question 8

Is SQS Push or Pull based?

Answer 8

Pull based

Question 9

You publish messages to SQS using this AWS component

Answer 9

AWS SDK

Question 10

When using the Extended Java Client Library what is the maximum message size?

Answer 10

2GB

Question 11

What is the minimum size of a message?

Answer 11

1 byte

Question 12

In SQS What are the 2 available types of queues?

Answer 12

• FIFO Queues

- Standard Queue

Question 13

Which queue type supports multiple ordered message groups within a single queue?

Answer 13

FIFO Queue

AWS SQS First-In-First-Out queues support multiple ordered message groups within a single queue. Limited to 300 transactions per second. SWS FIFO queues have all the same capabilities of a Standard Queue

Question 14

SQS message queues guarantee a message will be delivered how many times

kjuz ˌgɛrənˈti

Answer 14

“at least” once

Question 15

Queue type that supports multiple ordered message groups within a single queue

Answer 15

FIFO Queue

Question 16

SQS
What is the maximum visibility timeout period you can set?
(ˌvɪzəˈbɪlɪti)

Answer 16

12 Hours

Question 17

SQS

How long is the default visibility timeout period?

Answer 17

0 Seconds
30 Seconds (Default)
12 Hours

Visibility timeout sets the length of time that a message received from a queue (by one consumer) will not be visible to the other message consumers.

Question 18

SQS
The minimum visibility timeout period possible for messages

Amazon SQS doesn’t automatically delete the message. Because Amazon SQS is a distributed system, there’s no guarantee that the consumer actually receives the message (for example, due to a connectivity issue, or due to an issue in the consumer application). Thus, the consumer must delete the message

Answer 18

0 seconds

To prevent other consumers from processing the message again, Amazon SQS sets a visibility timeout, a period of time during which Amazon SQS prevents other consumers from receiving and processing the message. The default visibility timeout for a message is 30 seconds. The minimum is 0 seconds. The maximum is 12 hours.

Question 19

SQS

Which polling method should you use if you need a message right away (immediately)?

Answer 19

Short polling

Question 20

SQS

Which polling method will help you to reduce costs?

Answer 20

Long Polling

Question 21

SQS

What is the default polling method?

Answer 21

Short polling

Question 22

SQS

What type of polling returns messages immediately, even if the message queue being polled is empty?

Answer 22

Short polling

Question 23

SQS

What type of polling waits until a message arrives in the queue before polling?

Answer 23

Long Polling

Question 24

SQS can retain messages from ___ to ___ and by default is ___

Amazon SQS automatically deletes messages that have been in a queue for more than the maximum message retention period. You can set the message retention period using the SetQueueAttributes action.

Answer 24

• 1m
• 4 days (Default)
• 14 days

Question 25

What is SQS?

What are its 5 elements?

Answer 25

• It’s a message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications for application integration
• Types of Queues (Standard and First-In-First-Out)
• Polling types (Short and Long)
• Visibility time-out (0, 30s*, 12h)
• Retaining time (1m, 4d*, 14d)
• Message size (1b - 256kb) with JAVA (2 Gb)

Question 26

What is SNS?

What are its 5 elements?

Answer 26

• It’s apub/sub messaging service for application integration
• Topics
• Publishers
• Subscriptions
• Protocols (HTTP,Email, SQS, Lambda, SMS)
• Application as subscriber (Send push notifications)