My 2 Cents What Are Content Delivery Networks

Prasoon Arora

White Belt
A Content Delivery Network (CDN) works by providing alternative server nodes for users to download resources (usually static content like images and JavaScript). These nodes spread throughout the world, therefore being geographically closer to your users, ensuring a faster response and download time of content due to reduced latency
While CDNs are an appropriate solution for most websites looking for speed improvements, not every site necessarily needs one. It's important to understand how CDNs work and ultimately, if the benefits are worth the cost of adding one.
 

steve taylor

White Belt
You are right ,
A content delivery network is a system of distributed servers that deliver web pages and other web content to a user based on their geographical locations. The origin of the web page and a content delivery server.
This service is effective in fast-moving the delivery of content of websites with high traffic and websites that have a global approach. The closer the content delivery network server is to the user geographically, the content can delivered faster to user . content delivery network also provide protection from large flows in traffic.
 

Joe Cohen

New Member
You are right ,
A content delivery network is a system of distributed servers that deliver web pages and other web content to a user based on their geographical locations. The origin of the web page and a content delivery server.
This service is effective in fast-moving the delivery of content of websites with high traffic and websites that have a global approach. The closer the content delivery network server is to the user geographically, the content can delivered faster to user . content delivery network also provide protection from large flows in traffic.
Great summary. CDNs are helpful for anyone who needs speed improvements and want to fight against latency issues. But if your hosting server is in Bangalore and all of your readers are nearby (or you have a CDN with only one POP in India) than a CDN alone won't provide much help. However, even for US-based sites, if you have a blog and are hosted in Virginia, a POP in California will help deliver faster content for users in Los Angeles. This is especially critical when your site gets a lot of traffic or you are struggling with latency. (And many CDNs have value-added packages, offering more than just the CDN service). Individuals often don't see a huge difference though - although there is also research that a second delay in load time can lead to users leaving your site.

Personally, I like this description from Incapsula's CDN guide (disclaimer: commercial CDN provider, but it's a useful site):
To minimize the distance between the visitors and your website's server, a CDN stores a cached version of its content in multiple geographical locations (a.k.a., points of presence, or PoPs). Each PoP contains a number of caching servers responsible for content delivery to visitors within its proximity.​
In essence, CDN puts your content in many places at once, providing superior coverage to your users. For example, when someone in London accesses your US-hosted website, it is done through a local UK PoP. This is much quicker than having the visitor's requests, and your responses, travel the full width of the Atlantic and back.​
 
Content delivery networks is a geographically distributed network by proxy servers and their data centres. The terms CDN is an umbrella term spanning different types of content delivery services.
 

Saravanan28

Yellow Belt
A Content Delivery Network(CDN) is a globally assigned network of web servers whose reason for existing is to give speedier conveyance, and exceedingly accessible content.
 
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