Basics of VPN Section1

Basics of VPN - 1 Basics of VPN Introduction to VPN a VPN is a network that is it provides inter-connectivity to exchange information among various

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1) Basics of VPN Introduction to VPN a VPN is a network ; that is, it provides inter-connectivity to exchange information among various entities that belong to the VPN. Secondly, it is private , that is, it has all the characteristics of a private network. A private network supports a closed community of authorized users, allowing them to access various network-related services and resources. The traffic originating and terminating within a private network traverses only those nodes that belong to the private network. Further, there is traffic isolation. That is, the traffic corresponding to this private network does not affect nor is it affected by other traffic extraneous to the private network. The final characteristic of a VPN is that it is virtual. A virtual topology is built on an existing, shared physical network infrastructure. However, the virtual topology and the physical network are usually administered by different administrative bodies. VPNs can be formally defined as a communication environment constructed by controlled segmentation of a shared communications infrastructure to emulate the characteristics of a private network. VPNs are often installed by organizations to provide remote access to a secure organizational network. Generally, a VPN has a network topology more complex than a point-to-point connection. VPNs are also used to mask the IP address of individual computers within the Internet in order, for instance, to surf the World Wide Web anonymously or to access location restricted services, such as Internet television. 3. Motivations for VPNs: A virtual private network can resolve many of the issues associated with today’s private networks. a) Cost: Traditional private networks facilitate connectivity among various network entities through a set of links, comprising of dedicated circuits (T1, T3 etc.). The cost of such links is high especially when they involve international locations.(Venkateswaran, 2001). Even when VPNs are implemented on a provider private network, it would still be less expensive, since that private network will provide VPN services to many other b) Mobility of workforce: The percentage of people in the US workforce that depends on remote access to do their jobs is continually growing. Many companies are encouraging telecommunications to reduce their investment in real estate, reduce traffic, and reduce pollution from automobile. To support this, companies have to provide a reliable IT infrastructure like large modem pools and toll free numbers, all of which adds to their overhead cost.(Younglove, 2000). 5 c) E-commerce applications : such applications are deployed around inventory management, supply chain management, electronic data interchange etc. However, in traditional private networks, this kind of special access provision is difficult to incorporate because it is not easy to install dedicated link to all suppliers and business
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Basics of VPN - 1 Basics of VPN Introduction to VPN a VPN is a network that is it provides inter-connectivity to exchange information among various

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