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| Definition | Content Delivery Network is a collection of network of web servers distributed geographically / Points of Presence(PoP). |
| Traditional Method | Storing content on a single central server. |
| Purpose | Faster content delivery. |
| Replication | Data is replicated across all the servers in the internet using CDN. |
| Data Access | User access the data stored closest to him |
| Content Loading Speed | CDN =Fast, Traditional Method = slow. i.e long distance between two objects in communication takes more time. |
| Storing Efficiency | More in CDN compare to Traditional Method. |
| Content Distribution | Done to all geographically distributed data centers |
| Content Delivery Speed | Depends on Location (user is far to server takes more time to retrieve the content otherwise less) |
| Example | Cloud CDN Cedexis by Citrix used by Google |
| Content Provider | Organization of Content delivery network. |
| Authorization | It is done by Content Provider to deliver content using CDN. |
| Reporting | CDN provider gives the performance analytics to content provider to evaluate CDN Provider’s service quality. |
| Source | Content Provider sends a copy of content |
| Content | It is a digital information created for distribution |
| Request | user requests the Content Provider to view / store data |
| Deliver | CDN delivers the content to user |
| User | User is a entity requests data from the Content Provider. |
CDN architectures key components
| Origin nodes | Data / content is pushed / pulled to origin nodes / servers and stored in Edge nodes for delivery / storage. |
| Control nodes | These are used for management, routing, monitoring and security tools. |
| Delivery nodes | These are used by user are used receive or pull data from storage nodes. |
| Storage nodes | Storage nodes for better latency and lower demand on the origin servers. |
CDN Benefits
| Costs / pricing | For HTTP/HTTP(S), band width are reduced |
| load times | improved |
| global availability of the content | Increased |
| CDN Nodes deployed at | in multiple locations |
| Latency | It is the delay between a user's action and a web application's response. It is reduced. |
Types of content
| Content Type | Details |
| Dynamic content | Web server generates the content by the using programming languages (php, ruby or java). |
| Static content | Content is not generated and dont change. Examples Images, CSS, and JavaScript, etc. |
| Streaming content | These are videos / audio files played using web browser. |
Key features
| For Architects | Global distribution with anycast IP |
| For Developers | Optimized site performance using HTTP/2 and QUIC. |
| For Administrators | CDN is integrated with Stackdriver to provide latency metrics, HTTP request logs for analysis. |
Cloud CDN with HTTP(S) load balancing
Cloud CDN is configured with HTTP(S) load balancer (provides IP addresses and ports numbers for requests) and GKE to deliver content to your users.
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