S3

Question 1

What is S3?

Answer 1

S3 provides developers and IT teams with secure, durable, highly scalable object storage. It comes with a simple web services interface to store and retrieve any amount of data from anywhere on the web.

It is like a hard disk on the cloud

Question 2

S3 allows storage of what type of objects?

Answer 2

Files from 1 byte to 5TB in size. It is not suitable to install an OS on S3.

Question 3

What is the storage limit for each account?

Answer 3

Unlimited

Question 4

What are buckets?

Answer 4

Akin to a folder on a file system

Question 5

S3 is a universal namespace, meaning…

Answer 5

Names must be unique globally

Question 6

S3 provides read after write consistency for PUTS of new objects meaning…

Answer 6

Objects are available to read immediately upon storage in the cloud

Question 7

S3 provides eventual consistency for overwrite PUTS and DELETES meaning…

Answer 7

Modifications to stored objects are eventually propagated in the cloud

Question 8

S3 objects are simple key, value stores consisting of:

Answer 8

1. Key - the name of the object
2. Value - the data consisting of a sequence of bytes
3. Version ID
4. Metadata - data about the data being stored
5. Subresources
6. Access Control Lists

Question 9

What availability does Amazon guarantee?

Answer 9

99.99%

Question 10

S3 features include:

Answer 10

99.999999999% durability (11 X 9's)
Tiered storage
Lifecycle management
Versioning
Encryption
Access Control Lists and Bucket policies

Question 11

S3 - IA storage tier is good for

Answer 11

Data that is accessed less frequently, but requires rapid access when needed. Lower fee than S3, but you are charged a retrieval fee.

Provides SSL support

Question 12

Reduced Redundancy Storage tier

Answer 12

Designed to provide 99.99% durability and 99.99% availability of objects over a given year.

Provides SSL support

Question 13

Glacier

Answer 13

Very cheap, but used for archival only. It takes 3.-5 hours to restore from Glacier. It costs as little 1 cent per GB/month

Provides SSL support

Question 14

What does Glacier charge for?

Answer 14

Storage
Requests
Data Transfers

Question 15

Lifecycle management transition points include

Answer 15

Transition to the Standard - Infrequent Access Storage Class (128kb and 30 days after the creation date)

Archive to the Glacier Storage Class (30 days after IA, if relevant)

Permanently Delete

Question 16

To what object versions can lifecycle management be applied?

Answer 16

current and previous versions

Question 17

What is a CDN?

Answer 17

A content delivery network (CDN) is a system of distributed servers (network) that deliver webpages and other web content to a user based on the geographic locations of the user, the origin of the webpage and a content delivery server.

Question 18

Edge Location

Answer 18

This is the location where content will be cached. This is separate to an AWS Region/AZ

Question 19

Origin

Answer 19

This is the origin of all the files that the CDN distribute. This can be either an S3 bucket, an EC2 instance, an Elastic Load Balancer or Route53

Question 20

Distribution

Answer 20

This is the name given the CDN which consists of a collection of Edge locations

Question 21

What methods can be used to set up access control to buckets?

Answer 21

Bucket Policies

Access Control Lists

Question 22

True or False. All newly created buckets are PUBLIC.

Answer 22

FALSE. All newly created buckets are PRIVATE.

Question 23

What log auditing do buckets feature?

Answer 23

S3 buckets can be configured to log access requests. These logs can be done to another bucket or AWS account

Question 24

What are the two types of encryption for S3 buckets?

Answer 24

In Transit (SSL/TLS)
At Rest (Server and client side)

Question 25

List the server side encryption methods

Answer 25

S3 managed keys (SSE-S3)
AWS Key management (SSE-KMS)
Customer Provided Keys (SSE-C)

Question 26

What is storage gateway?

Answer 26

A service that connects an on-premise software appliance with cloud-based storage to provide seamless and secure integration between an organizations on-premise IT environment and AWS storage infrastructure.

Question 27

What are the three types of storage gateways?

Answer 27

Gateway Stored Volumes
Gateway Cached Volumes
Gateway Virtual Tape Library

Question 28

What architecture does gateway stored volumes employ?

Answer 28

Entire data set stored locally.
Gateway backs data up asynchronously to S3.
Good solution for durable and inexpensive backups that you can recover locally or from EC2

Question 29

What architecture does gateway cached volumes employ?

Answer 29

Most frequently accessed data is stored locally
Entire data set is stored in S3.
Must have internet connectivity to access all of your data.

Question 30

Describe Virtual Tape Library (VTL)

Answer 30

Mimics physical tape library. Uses an industry standard iSCSI interface which provides online access to virtual tapes for popular apps like NetBackup, BackupExec, Veam, etc.

Question 31

List the two types of Export/Import

Answer 31

Import/Export Disk

Import/Export Snowball

Question 32

What is Import/Export Disk

Answer 32

Allows bypass of the internet by using portable devices for transport which is used on Amazon’s internal high-speed network.
Supports import to EBS, S3, Glacier and export from S3

Question 33

What is snowball used for?

Answer 33

Transfer of petabyte-scale data storage.

supports import/export to S3 only

Question 34

What is transfer acceleration?

Answer 34

Method used to accelerate uploads to S3 through the use of URLs to upload to a nearby edge location which will transfer the data to S3