By Dinesh C. Verma
Content material distribution networks (CDNs) are the main promising new innovations for dealing with the massive and speedily transforming into quantity of net site visitors. In essence, CDNs are teams of proxy-servers situated at strategic issues round the web and organized that allows you to make sure that a obtain request can continuously be dealt with from the closest server. during this, the 1st reference within the box, a famous CDN pioneer describes some 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 the entire sensible fundamentals and offers necessary implementation schemes.
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Extra resources for Content Distribution Networks: An Engineering Approach
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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.
Security, unfortunately, always comes at the expense of performance. However, depending on the security level of the surrogates, it may be possible to place a limited amount of secure content on a surrogate. Despite these limitations, a large number of applications are very well suited to a CDN approach. Many applications contain a mix of functions that can be off-loaded to a surrogate server and those that cannot be off-loaded. Such applications can still benefit from the use of CDNs to improve some aspects of their performance.
The hit ratio is the probability that a client’s request will be completely satisfied by the surrogate. In applications where this hit ratio is very high, the content distribution networks are likely to result in an improved response time for the end-user. In applications where the hit ratio is poor, the content distribution networks are not likely to be of use. Traffic flows in most applications deal with transfer of data between a client and a server. Such exchanged data may be static or dynamic.