Content Distribution Networks: An Engineering Approach by Dinesh C. Verma

By Dinesh C. Verma

Content material distribution networks (CDNs) are the main promising new suggestions for dealing with the large and speedily transforming into quantity of web site visitors. In essence, CDNs are teams of proxy-servers positioned at strategic issues round the net and organized on the way to make sure that a obtain request can consistently 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 stories, he covers the entire functional fundamentals and offers priceless implementation schemes.

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Content material distribution networks (CDNs) are the main promising new strategies for dealing with the large and rapidly becoming quantity of net site visitors. In essence, CDNs are teams of proxy-servers positioned at strategic issues round the web and organized that allows you to make sure that a obtain request can regularly be dealt with from the closest server.

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It must use some other identifier to distinguish among the different servers. One identifier that can be used is the MAC address of the interfaces connecting the servers and the load balancer. The load balancer uses a slight modification of normal IP processing to forward the packet. 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.

The performance perceived by the client when going to the original server via the surrogate is likely to be worse than if it went directly to the original server. After all, the surrogate site adds some latency to the request handling, and serves no function other than acting as a relay. Thus, the effectiveness of the content distribution network is highly dependent on the hit ratio that can be supported by the surrogate. The hit ratio is the probability that a client’s request will be completely satisfied by the surrogate.

This can be done if the networking stack within the server has a module supporting network address translation, and it is configured to do the right translation. 3. 3. 42 SITE DESIGN AND SCALABILITY ISSUES have made the assumption that a different reverse network address translator will be used for each server. However, these three can be combined together, and their function performed by a single network address translator. The number of network address translators to be used for the forward or reverse path would be determined by the processing capacity of each of the servers and the boxes.

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