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

By Dinesh C. Verma

Content material distribution networks (CDNs) are the main promising new ideas for dealing with the massive and rapidly growing to be quantity of net site visitors. In essence, CDNs are teams of proxy-servers positioned at strategic issues round the web and organized which will make sure that a obtain request can continually be dealt with from the closest server. during this, the 1st reference within the box, a well-known CDN pioneer describes a number of the applied sciences concerned and explains how they got here jointly to shape a operating procedure. With the aid of case reports, he covers all of the sensible fundamentals and gives important implementation schemes.

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Since the surrogate does not modify the packets being relayed back and forth, it only needs to do application level processing when the connection is established and the right server to process the request is determined. After the connection is established, the surrogate load balancer can transport the packets back to the original client, doing the minimum possible processing to maintain the illusion that the packets are flowing on the same connection that was established by the client to the surrogate.

The typical mapping used in the LAN emulation over ATM is one-to-one. 2 SCALABLE SITE ARCHITECTURE The design of a scalable site can essentially be defined as the problem of creating a server application that appears to be running on a single machine to the client, even though it consists of multiple server applications running on independent machines. When a client request comes into the site, it is handled by the application running on one of the independent machines. In this section, we look at the various techniques that can be used to make sure that the request is handled by one of the machines within the network.

Com. The packets from the external clients would be addressed to the load balancer. However, the load balancer does not accept any connections. Instead of doing the TCP processing, the load balancer selects one of the back-end web servers and forwards the packet to it. The transport protocol processing is done by the back-end web server. The load balancer detects the start of a new connection by observing packets with the SYN flag turned on in the TCP header. It makes a load balancing decision, and creates an entry in a local table mapping the IP address of the client and the port number used for this new TCP connection to the selected web server.

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