SQS

Question 1

Can I delete all messages in a queue without deleting the queue itself?

Answer 1

Yes, using the PurgeQueue action.

Question 2

Does SQS provide message ordering?

Answer 2

Yes and No.

Standard queues may not preserve ordering, but the newer FIFO queues guarantee that they will preserve ordering.

Question 3

In general, you should use a maximum of __________ for a long-poll timeout.

Answer 3

20 seconds

Question 4

True or False: SQS is PCI DSS Level 1 certified.

Answer 4

True.

Question 5

An SQS message can contain up to __________ metadata attributes.

Answer 5

10

Question 6

Does SQS guarantee delivery of messages?

Answer 6

Yes.

Standard queues provide at-least-once delivery.

FIFO queues provide exactly-once delivery. This means that each message is delivered once and remains in the queue until a consumer process deletes it.

Question 7

How does SQS handle messages that can’t be processed?

Answer 7

Dead letter queues are available but must be configured.

Question 8

What is the maximum number of inflight messages for a standard queue?

Answer 8

120,000

Question 9

The default message retention period is __________.

Answer 9

4 days

Question 10

Visibility timeout can be set between __________ and __________.

Answer 10

0 seconds, 12 hours.

Question 11

True or False: SQS doesn’t provide the ability to encrypt messages in a queue.

Answer 11

False.

SQS provides the ability to encrypt messages using KMS keys.

Question 12

Delivery delay can be between __________ and __________.

Answer 12

0 seconds, 15 minutes

Question 13

The period of time during which SQS prevents other consumers from receiving and processing a particular message.

Answer 13

Visibility timeout.

Question 14

Receive message wait time can be set between __________ and __________.

Answer 14

0 seconds, 20 seconds

Question 15

For anonymous access, what is the value of the SenderId attribute for a message?

Answer 15

The author’s IP address.

Question 16

How is SQS different from SNS?

Answer 16

SQS is a message queue service used by distributed apps to exchange messages through a “pull” model; polling required.

SNS allows apps to send messages to multiple subscribers through a “push” mechanism; no polling required.

Question 17

SQS messages can be between __________ and __________ in size.

Answer 17

1 B, 256 KB

Question 18

Message retention period can be set between __________ and __________.

Answer 18

1 minute, 14 days

Question 19

True or False: A message queue’s name must be unique within the AWS account.

Answer 19

True.

Question 20

True or False: SSE encrypts the body of a message and the message metadata.

Answer 20

False.

SSE only encrypts the body of the message.

Question 21

What is the Receive Message Wait Time?

Answer 21

The max amount of time a long-polling request will wait before returning an empty response.

Question 22

What is SQS long polling?

Answer 22

A way to retrieve messages that, unlike short polling, doesn’t return a response until a message arrives in the queue or times out.

Question 23

What is a visibility timeout?

Answer 23

A period of time during which SQS prevents other consumers from receiving and processing a particular message.

Question 24

Can I share messages between queues in different regions?

Answer 24

No.

Each SQS queue is independent with each region.

Question 25

True or False: SQS supports message metadata.

Answer 25

True.