S3 and Cloudfront

Question 1

How large can individual S3 files be?

Answer 1

5 TB

Question 2

What is the S3 maximum storage allowed?

Answer 2

No limit

Question 3

What are the types of URL formats for S3 bucket access?

Answer 3

Virtual hosted style

Path style

Question 4

When you upload a file to S3, success is indicated by …..

Answer 4

An HTTP 200 code

Question 5

What is the data consistency model for S3? Why does it work that way?

Answer 5

Read after Write - New object PUTS

Eventual Consistency - Overwrite PUTS and DELETES

Propagation across AZs can take time for updates and deletes

Question 6

What are the characteristics of an S3 object?

Answer 6

Key - Name of the object

Value - Binary data

Version ID

Metadata

ACL - individual permissions

Torrent

Question 7

What are the S3 SLA guarantees for availability and durability?

Answer 7

99.9% Available

11 x 9 Durability

Question 8

What are the features that S3 buckets support?

Answer 8

Lifecycle Management

Versioning

Encryption

ACL Security (individual files)

Bucket Level Security)

Question 9

What are the available S3 storage classes?

Answer 9

S3 Standard

S3 - IA

S3 One Zone - IA

Glacier

Question 10

What are the features of the S3 Standard storage class?

Answer 10

99.99% Availability

11 x 9 Durability

99. 9% Availability Design
100. 9% Availability SLA

No data retrieval fee

Stored across multiple disks and AZs

Designed to sustain loss of 2 facilities

Question 11

What are the features of the S3 - IA storage class?

Answer 11

Used for data accessed less frequently but requires rapid retrieval when needed

11 x 9 durability

99.9% Availability Design

99% Availability SLA

Per GB retrieval fee

Multiple AZ storage

Lower cost the standard but charges for retrieval

Question 12

What are the features of the S3 One Zone IA storage class?

Answer 12

Lower cost than S3 - IA

Only stored in 1 AZ

11 x 9 durability

99.5% Availability Design

Per GB retrieval fee

99% Availability SLA

No multiple AZ storage

Question 13

What are the features of the Glacier storage class?

Answer 13

Very inexpensive

Used for archival purposes only

3 retrieval levels: Expedited (minutes), Standard(3-5 hours), Bulk (5-12 hours)

Per GB retrieval fee

Question 14

What are the potential sources of charges for S3 buckets?

Answer 14

Storage

Requests

Tags

Data Transfer (replication)

Transfer Acceleration

Question 15

What are the parts of a virtual hosted S3 bucket URL?

Answer 15

The bucket name is part of the domain name

http://bucket_name.s3.amazonaws.com

or

http://bucket_name.s3-aws-region.amazonaws.com

Question 16

What are the parts of a path style S3 bucket URL?

Answer 16

The endpoint must match the region

http://s3-aws-region.amazonaws.com/bucket_name

Question 17

Edge Location

Answer 17

Seperate from an AWS region. The location where content will be cached

Question 18

CDN Origin

Answer 18

Origin of the files to be distributed by the CDN

Question 19

What is a CDN?

Answer 19

Content Delivery Network

Cache Locations (Edge)

Cache files from an origin on first request

Edge Locations all over world

Reduces stress on wen servers

Question 20

What is a Cloudfront Distribution?

Answer 20

Specifies where you want your content origin is and how to track and manage content delivery

Question 21

How can Cloudfront support dynamic content?

Answer 21

It accepts querystring parameters and matches them to a cached response

Question 22

What are possible Cloudfront Origin types?

Answer 22

S3 Bucket

EC2 Instance

Elastic Load Balancer

Route 53

Your own web server

Question 23

What are the types of Cloudfront distributions?

Answer 23

Web

RTMP (Flash streaming)