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Content networks (CNs) are mainly used by the users to access the resources on the internet. CNs can be categorized as follows: content distribution, content routing, content switching, content management, content delivery, and intelligent network services, which include QoS, security, multicasting, and virtual private networks (VPNs). CNs is normally of two types
■ caching downloaded Internet information ■ Distributing Internet traffic loads across multiple servers CNs can be used to minimize the bandwidth you need for the internet connections. When we download some data from the internet it is cached on a local server, Now when we make another request for data, first of all this request is checked on the local server’s cache, if the data exists in the server cache the request is fulfilled, this improves performance and efficiency because we don’t need to access the data from the internet, we simply took it from the local server. If no data for the respective request is present on the local server then the information will be obtain from the internet resource. Most of the pages in your website might have contained a lot of Images so these images don’t downloaded repeatedly. The main issue with this method is that all the data movements on the network must pass the CN device, called proxy server, so the throughput can be reduced. CNs are also helpful in reducing the extra load from the external users who want to access the server resources in the network. Previously some times if the server was having a large number of requests which makes the server overcrowded, the solution for this problem was to upgrade the server resources to fulfill these requests and decrease overhead on the server. Server up gradation includes upgrading the processor, memory, disk drive, interface cards, up gradation is a very complex process. Now CNs simplifies such overheads, it simply distribute the user’s requests load on multiple internal servers, so it is reducing network overcrowding to the servers and reducing the resources required to handle the user’s requests. CNs are normally best fit for LAN environments so we used them in LAN environments. So the CNs are used to access external resources more efficiently, provide better throughput and redundancy for local resources and to reduce overcrowding of the requests on the server. |
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