AWS Integration & Messaging

Question 1

Can SQS have duplicate messages? At least once delivery

Answer 1

Yes

Question 2

Fully managed service, used to decouple applications

Answer 2

Amazon SQS – Standard Queue

Question 3

Fully managed service, used to decouple applications

Question 4

Can SQS have out of order messages?

Answer 4

Yes

Question 5

Unlimited throughput, unlimited number of messages in queue
* Default retention of messages: 4 days, maximum of 14 days
* Low latency (<10 ms on publish and receive)
* Limitation of 256KB per message sent

Answer 5

SQS

Question 6

regulate access to the SQS API

Answer 6

IAM Policies

Question 7

In-flight encryption using HTTPS API
At-rest encryption using KMS keys
Client-side encryption if the client wants to perform encryption/decryption itself

Answer 7

AWS SQS + SNS

Question 8

After a message is polled by a consumer, it becomes invisible to other consumers

Answer 8

SQS – Message Visibility Timeout

Question 9

If a message is not processed within the visibility timeout, it will be processed twice

Answer 9

True

Question 10

“wait” for messages to arrive if there are none in the queue

Answer 10

Long Polling

Question 11

Decreases the number of API calls
made to SQS while increasing the efficiency and
reducing latency of your application

Answer 11

Long Polling

Question 12

First In First Out (ordering of messages in the queue)

Answer 12

Amazon SQS – FIFO Queue

Question 13

Unlimited throughput, unlimited number of messages in queue

Answer 13

Amazon SQS – Standard Queue

Question 14

Limited throughput: 300 msg/s without batching, 3000 msg/s with

Answer 14

Amazon SQS – FIFO Queue

Question 15

Send one message to many receivers

Answer 15

Amazon SNS