The CDN, whose acronym is Content Delivery Network, is nothing more than a computer network where copies of the information are stored, which can be placed in different points so that this information reaches another client and the latter can access the copy. of the same. Causing several clients to have a copy of the same information, based on a central server. The main reason for a CDN to exist is the reduction of the response time and loss of information, placing all data in a central service as a copy and that other clients or users have accessibility. The main objective of this is to find a balance that is low cost and that keeps all the providers of the web content of a service or web page with the same copy of the information.
This type of services has certain advantages that represent help to customers and suppliers. There is a reduction in the load of the servers thanks to the distribution of the traffic network. The reduction of latency is maintained while we find the increase of the bandwidth, and at the same time, the web caching increases.
How is a CDN system produced?
In order to produce a service such as the CDN, there must first be the need to produce a content delivery component, while at the same time it must have an origin, where all the data that we will need as a copy is distributed to distribute it to substitute servers for clients, that is, make a replica of content. There must be a request enroturador, that remains attentive to the demands and needs of customers, and for this, there must be users who request those substitute servers with the copy of the data.
This information, from which a copy will be taken, requires interaction from the main component of origin until the copy of the data, to keep it updated. If the source service has a change, the substitute service must present this same change, and for this, there must be a component that is responsible for distributing the content.
All this procedure must be taken into account with an accounting margin in order to maintain a record of accesses of customers who have been or use the substitute servers, and at the same time, this helps to produce a presentation of traffic and billing reports.
How does a CDN work?
It works on decreasing the distance between a customer with a home base and another client or user who wants to have a cached version of the content or data, for this, the CDN is responsible for distributing in different geographical locations copies of this cache, stored and responsible for being used by users who require this information.
What are the benefits of a CDN server?
The benefits that a CDN can provide may vary depending on the demand offered by an internet property, but basically, there are benefits that we will always be able to find in this type of systems. One of the main ones is going to be that when using a CDN service, you can improve the loading time of a web page, since the distributor or copy that is closest to the visitor of the site, can experience loads of the pages faster. So a CDN system can keep users on the website without there being any need for them to leave it, increasing the time they are connected to the website.
There is a reduction in bandwidth costs, it also has a greater availability of content and redundancy, reducing interruptions due to traffic or hardware failures, thanks to the fact that the system supports this type of failures. It also improves the security of the website by improving security certificates and other optimizations.
Who uses a CDN service?
While you are reading this article, in the world many people are in the middle of network traffic and are already being served by a copy of the data they are looking for. The numbers of users who use the CDN without even realizing it are increasing. There are certain web sectors that need this type of services, we can find electronic commerce, mobile devices, media and entertainment, health care, online games, governments, and even collaborate to educate people by providing them with a quick and easy entry to the websites.
What are the business objectives?
The main objective of the business is to enlarge the company, to find the ability to expand and be able to handle a large amount of data, users, and transactions. For this, the service with the web page must have a capacity for the delivery of dynamic content of high quantity and that aside, has a low cost of operation.
The security of the business requires that there is a protection of the data against modifications and access by unauthorized users, to ensure that interruptions caused by others on the website can be reduced.
The CDN service wants to present apart reliability, responsiveness and good performance, services must be available and prepared for the handling of possible interruptions, increasing the tolerance of the network to certain failures.
How does a service like the CDN maintain a website that is always online?
Based on the uptime or activity time, which is the element of great importance for any web page, the CDN has security against failures or interruptions proposed by hardware or simple traffic. By decreasing this, they must decrease the downtime rate or downtime, placing the percentage of high and reliable service guarantee for a web page.
So we say that a well-rounded CDN has several features that will minimize downtime, but how does it do it? First, it presents a load balance, which is no more than a good distribution of network traffic to proxy servers. Then, if an error occurs in one of the servers that are close to a user, it is interrupted, and this time it uses another substitute server to replace the one that is interrupted, in order to distribute the traffic to the other servers.