CloudFront

Question 1

What does CDN stand for?

Answer 1

Content Delivery Network

Question 2

What is a Content Delivery Network?

Answer 2

A Content Delivery Network is a system of distributed servers that deliver web content to a user based on the geographic locations of the user, the origin of the webpage, and a content delivery space.

Question 3

What is an Edge Location?

Answer 3

A location where content is cached. (This is separate from an AWS Region/AZ)

Question 4

In the context of CloudFront and Content Delivery Networks, what is an origin? What are some examples of origins?

Answer 4

The origin of all the files that the CDN will distribute.

This can be an S3 bucket, an EC2 instance, an Elastic Load Balancer, or Route53

Question 5

In the context of CloudFront, what is a Distribution?

Answer 5

the name given to the CDN, which consists of a collection of edge locations

Question 6

Are edge locations read-only?

Answer 6

No. You can write to an edge location too!

Question 7

What is Amazon CloudFront?

Answer 7

CloudFront is the AWS-integrated CDN

CloudFront can be used to deliver your entire website, including dynamic, static, streaming, and interactive content, using a global network of edge locations.

Question 8

Why is Amazon CloudFront good for performance?

Answer 8

Geographic Cacheing. Requests for your content are automatically routed to the nearest edge location, so content is delivered with best performance possible.

Question 9

What does RTMP stand for?

Answer 9

Real-Time Messaging Protocol

Question 10

What are the 2 types of distributions used for CloudFront?

Answer 10

• Web Distribution - for websites
• RTMP - for media streaming

Question 11

Can you clear cached objects in an edge location?

Answer 11

Yes, but you will be charged. (Invalidating the Cache)

Question 12

In the context of CloudFront, what is the Time To Live?

Answer 12

How long objects are cached in an edge location.

This is a configurable amount.

Question 13

What does TTL stand for?

Answer 13

Time To Live

Question 14

What are the areas for which you are charged in CloudFront?

Answer 14

• Data Transfer Out
  
  • To the internet from the edge locations
  • from cloudfront to the origin server
• Requests
  
  • HTTP/HTTPs
  • Origin Shield
  • Invalidation
  • Field Level Encryption
  • Real-Time Log
• Dedicated IP Custom SSL certificates associated with a Cloudfront Distribution

Question 15

Suppose you have specific items in CloudFront that you want to keep in the cache longer than normal. How can you accomplish this?

Answer 15

Utilize a Cache-Control header for these items