What is Content Delivery Networks (CDN)
Content delivery networks are considered as a means of a source of income from the web. The companies having the facility of content delivery network initially sign up an agreement with the content providers. Once the agreement has been made, the owner gives its content to the Content Delivery Network, which upon receiving performs preprocessing and distribution. The CDNS efficiently distributes the content to the end-users by applying certain changes.
Apart from distributing the content to the end-users, CDNS even contacts different ISPS and provides a nice pay to them if they allow a remotely-managed server along with significant content to be located on their corresponding LANs. This not only becomes a means for the source of income but also enables the ISPS to gain a competitive advantage by providing the customers with a higher response time for accessing CDNs content. As content is replicated at multiple locations, it is possible to enhance the performance level of the website. This can be done by following a procedure of redirecting the request of the client to the CDN server, which is located at the client’s ISP.
Here, the CDN server is basically a proxy having a huge amount of cache that consists of critical content. Whenever a request is made, the proxy searches for the file within the cache. if it is available then it is sent to the client. otherwise, the requested page is fetched from the actual server and archived in the cache for future use. The advantage of considering a content server as a proxy, instead of a replica enables the CDN to reduce the disk consumption, preload time. However, it must be ensured that the reduction is performed without changing the DNS or any part of the internet infrastructure.
Some of the important Content Delivery Network (CDN) Providers are Cloudflare, AWS, Google Cloud, Stack Path, Akamai, KeyCDN, Cachefly, Limelight, etc.