Content delivery network solutions

High bandwidth means high expenses for the bandwidth and many companies are looking to Content Delivery Network service companies to cut down the bandwidth bills.

There are many Content Delivery Network (CDN) companies, for example, Akamai, LocalMirror, Streaming1, Mirror Image, UltraCDN, Value CDN and others, that push the content closer to the end user and offer better pricing in some cases.

Content Delivery Network Scheme

CDN’s usually work like this.

They push static content closer to the end user physically or at least calculate the shortest path and/or lowest latency between the end-user and the cache.

In this case, the user is U1 (see the above picture), C1 and C2 – caches, S1 – real server.

User (U1) requests are all answered by DNS queries and all dynamic content requests go to server S1, while all static content requests are forwarded to C1 or C2. This is usually done by linking static content with a different hostname or sub-domain that resolves directly to the closest and fastest cache node.

For example, if you are located in Germany, a server in Germany servers all your static content while all dynamic content, for example, php scripts and queries are served by server located in USA. You pay less because it’s a local peer traffic, or less expensive transfer, plus, you get a better speed and lowest latency.

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