CDN

Question 1

What is AWS CloudFront?

Answer 1

Amazon CloudFront is a global content delivery network (CDN) service that accelerates delivery of your websites, APIs, video content or other web assets.

Question 2

Does an CloudFront Edge location is related to an AZ?

Answer 2

No.

Question 3

What is an Edge Location?

Answer 3

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

Question 4

What is an origin in CloudFront?

Answer 4

Is the source of the files that the CDN will distribute: S3 bucket, EC2 instance, ELB or Route53

Question 5

What type of CloudFront distribution exists?

Answer 5

Web distribution

RTMP

Question 6

What is the format of an CloudFront url?

Answer 6

http://f1g42olgu3q9vj.cloudfront.net/fileName

Question 7

What is a CloudFront Distribution?

Answer 7

It’s the name given the CDN which consists of a collection of Edge Locations.

Question 8

Is it possible to have only one or multiple origins for an Edge Location?

Answer 8

It is possible to have multiple origins

Question 9

How much time is an object cached in an Edge Location?

Answer 9

For the life of the TTL

Question 10

Can you clear an Edge Location cache? What impact does it have in terms of cost?

Answer 10

You can clear cached objects, but you will be charged.

Question 11

Are Edge Locations read-only?

Answer 11

No. You can write to them too.

Question 12

How can you protect resources using CloudFront?

Answer 12

Using signed URL’s with expiry dates or signed cookies

Question 13

How can objects be prevented from being cached?

Answer 13

Creating invalidations

Question 14

Can I prevent users from specific countries to access resources?

Answer 14

Yes, with Geo-Restrictions.