By Dinesh C. Verma
Content material distribution networks (CDNs) are the main promising new innovations for dealing with the large and speedily turning out to be quantity of web site visitors. In essence, CDNs are teams of proxy-servers positioned at strategic issues round the web and organized so one can make sure that a obtain request can regularly be dealt with from the closest server. during this, the 1st reference within the box, a famous CDN pioneer describes many of the applied sciences concerned and explains how they got here jointly to shape a operating method. With the aid of case reviews, he covers all of the useful fundamentals and gives helpful implementation schemes.
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Extra info for Content Distribution Networks: An Engineering Approach
Therefore, content distribution networks should be designed with a strong emphasis on the manageability of the surrogate servers and surrogate sites. Another drawback of content distribution networks is that applications may need to be redesigned in order to exploit the existence of surrogates. Such a redesign may not be an issue in the case of many applications, but can pose a real challenge for others. Applications that are being newly developed can indeed be written to exploit a CDN. However, existing applications may need some changes before they can use the surrogate servers.
For many common types of applications, an ISP may provide surrogates. The application surrogates can help in reducing the application response time, as well as the bandwidth that needs to be carried across an ISP network. , protecting against spammed mail or filtering out objectionable content. For example, many ISPs provide proxies for web servers. These proxies can implement functions such as caching of static images and static content, transforming the pages, or filtering out objectionable content using the PICS  rating scheme.
Once it has determined the right server to forward the packets to, it creates a MAC packet with the right address to ensure delivery of the packet. The backend servers receive the packet, since it is addressed to their MAC address, check the IP address to see that the packet is intended for them, and then receive the packet for further processing. When they send the packet out, they send it out using the right IP address.