Although CDNs appeared more than ten years ago, they started gaining popularity only recently. Despite the fact that this technology has constantly been developed and improved, the main idea behind Content Delivery Networks stayed the same: it serves to transfer the content to end- users, connecting them to the nearest server. By now, a CDN is a real necessity, because users and web-masters have to transfer a huge amount of information, which required a lot of resources. What a CDN does is accelerating sites, optimizing page load and replicating content all at once.
Benefits for end users
Less Latency. The term "latency" means delay time of the system. The lower the latency is, the faster the information packages are sent and received. Being a chain of servers around the globe, CDN significantly lowers latency, greatly improving users' experience, selecting the closest server.
Due to that packets loss is also less: all information is transferred quicker, going through shorter distances. As the result, video streaming is more effective, network peaks and drops go almost unnoticed. Interesting to note that people in less populated places enjoy the best performance and content quality.
Reliability improvement. People watching videos through a CDN are supplied with high reliability of HD video loading and high service quality. It is provided by acceleration technology that increases general reliability of content delivery in the system.
Benefits for Website Owners
Total Availability is what all website masters need. Due to the fact the content is duplicated on all servers of a network around the world, even in case of failure of several servers the information will still be available on the rest ones. Thus, regional failures and disasters are not the reason for downtime: content will always be available.
Lower Network Load. This is what also matters for both website owners and server operators. The less load is, the better a site works. Network load mostly depends on the number of users and, consequently, consumed resources: sometimes they are not enough to be equally shared between all visitors. CDN will add to these resources, attracting more users who get sufficient speed and content quality, thus, staying satisfied.
Besides, CDN lowers delivery costs. Due to the fact that traffic is diverted into edge servers, load is evenly distributed, which decreases delivery cost.
Higher Quality of Service, which means the possibility of providing different priorities to users and applications concerning data flow. QoS is a guarantee of lower rate of errors, jitters, failures, etc. arising in the course of site functioning. The higher QoS is the less is the amount/probability of problems and issues arising during data transfer.
There are many CDN resellers and direct providers. How can a user know which company is better? In fact, there is no certain leader in this sphere – every provider has his own competitive strengths and drawbacks, and you should judge by your own needs. CDN comparison and profound analysis will definitely help to find an optimal variant, and you won't have to switch providers and lose money.
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