AWS Simple Storage Service

Question 1

What type of storage is Simple Storage Service (S3)?

Answer 1

Object storage

Question 2

What is the encryption used on server side encryption for Simple Storage Service?

Answer 2

AES-256

Question 3

What is the availability of Simple Storage Service?

Answer 3

4 x 9s (99.99%)

Question 4

How many availability zones is Simple Storage Service data replicated to?

Answer 4

3 Availability Zones (3 AZs)

Question 5

Who holds the master key for Simple Storage Service encryption?

Answer 5

AWS- in Key Management Service (KMS)

Question 6

Are all objects encrypted using the same master key? (are the keys changed over time?

Answer 6

No, the keys are rotated each month

Question 7

The master key is used in the process to encrypt an object, is this the only key?

Answer 7

No, there is a ‘per object’ key

Question 8

Is the ‘per object’ key encrypted?

Answer 8

Yes, it is encrypted by the master key

Question 9

Is the object data encrypted at rest?

Answer 9

Yes

Question 10

What are the storage classes available in AWS?

Answer 10

S3 Standard
S3 Standard IA
Zone IA
Intelligent Tiering
Glacier
Glacier Deep Archive

Question 11

Where is the ‘per object’ stored?

Answer 11

In a hidden S3 bucket

Question 12

Are there other options available to encrypt an object?

Answer 12

Client side encryption using the Software Development Kit (SDK)

Question 13

What is the minimum size of data you can put in Simple Storage Service?

Answer 13

1 byte

Question 14

If you put data in a single regions, is that data/object replicated to other regions?

Answer 14

No, data stays within a region

Question 15

Can you copy data to other regions?

Answer 15

Amazon Machine Image (AMI) Copy enables you to easily copy your Amazon Machine Images between AWS Regions

Question 16

What is the max size of data you can place in Simple Storage Service?

Answer 16

5 Terabytes

Question 17

How would you make an HTML page available to people on the internet?

Answer 17

Use static web hosting

Question 18

How can you delete an object after a defined period of time?

Answer 18

Use life cycle policies

Question 19

Can life cycle policies be applied to just one object within a bucket?

Answer 19

Yes, using the prefix parameter

Question 20

What is the durability of Simple Storage Service (S3)?

Answer 20

11 x 9s (99.999999999%)

Question 21

How would you apply life cycle policies to an entire bucket?

Answer 21

Use the ‘Apply to Entire Bucket’ parameter

Question 22

If you do not need S3 data available on demand, how can you lower the cost of storage?

Answer 22

Use AWS Glacier

Question 23

How can you move data into Glacier storage?

Answer 23

Use life cycle policies

Question 24

How can we ensure that when an object is updated or deleted, that we can get the old data?

Answer 24

Use S3 Versioning

Question 25

Can versioning and life cycle policies be used at the same time?

Answer 25

No

Question 26

Is encryption set at the object level or the bucket level?

Answer 26

Encryption is enabled and applied at the bucket level

Question 27

Can versioning be removed easily?

Answer 27

No

Question 28

What is the minimum number of copies in a Region of an S3 object?

Answer 28

3 (3 AZs)

Question 29

What is WORM architecture?

Answer 29

Write One Read Many Times

Question 30

Is S3 a WORM architecture?

Answer 30

Yes

Question 31

What is eventual consistency?

Answer 31

When an object is updated in S3 by many users across the availability zones, the object that is wrote last will be the one that all other copies become

Question 32

When you write an object to S3, will all availability zones have a consistent copied of the object?

Answer 32

Yes, new objects are synched across all availability zones

Question 33

Is there any region that does not support read after write?

Answer 33

US-Standard

Question 34

Is S3 a WORM architecture?

Answer 34

Yes

Question 35

Do you get a sync write across all availability zones during an update?

Answer 35

No object is asynchronously written to the other availability zones within the region

Question 36

When you delete an object, are all objects dated before you get an acknowledgement to say the operation was successful?

Answer 36

No

Question 37

What is read after write?

Answer 37

Data is available to read in all availability zones after an acknowledgement is returned

Question 38

Is data replicated across regions?

Answer 38

No

Question 39

What stops your data from having bitrot? (Bitrot is where your data at rest gets corrupted)

Answer 39

AWS checks objects on a regular basis to make sure their check sum is correct

Question 40

When bitrot is detected, what will AWS do about it?

Answer 40

AWS will restore the corrupt data using the redundant copies

Question 41

Will all incoming object requests be sent to the same availability zone?

Answer 41

No, requests are load balanced across all availability zones

Question 42

What is S3 RRS?

Answer 42

Reduced Redundancy Storage

Question 43

How durable is RRS?

Answer 43

4 x 9s (99.99%)

Question 44

What happens when an object is lost from RRS

Answer 44

A ReduceRedundancyLostObject event is triggered

Question 45

What is the max UTF-8 name size of a bucket?

Answer 45

1024 bytes

Question 46

What is the durability of S3?

Answer 46

11 x 9s (99.999999999%)