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Because the virtual corporation comprises distinct and often geographically dispersed locations, and because remote workers and home offices have become so common, networks have evolved to support interconnections of multiple offices at a reasonable cost and remote access to corporate databases. The competitive nature of today s marketplace requires that employees have immediate and efficient access to the most current information available, and that they be able to work remotely as efficiently as if they were directly connected to the corporate network. Another advantage deals with extending the cloud beyond its traditional margins. By creating a virtual corporate network, customers can be brought in electronically to ensure the timely exchange of information and enhance customer relationship management. One solution that is commonly used is the Virtual Private Network (VPN), which is a cost-effective alternative to a dedicated facility. Instead of paying the mileage charges associated with private line, a VPN replaces the dedicated circuit with the public Internet, the use of which has no distance component associated with it. When a remote user accesses a corporate network using a VPN, they do not dial directly into the corporate network. Instead, they create an Internet connection by dialing into a local ISP and then use secure protocols to create a tunnel through the fabric of the Internet that safely transports the information between the remote worker and the corporate network. The Internet simply becomes an extension of the corporate network, providing access for remote workers. To protect the user and the company, secure protocols enable information to be passed safely between a remote employee and corporate computer systems. The difference between these two techniques is shown in Figure 7-21. Design considerations must be taken into account when implementing a VPN. If the majority of the users are geographically collocated, a dialup solution may be perfectly acceptable since they will incur no distancerelated charges as a result of their connection sessions. If they are more geographically dispersed, however, an Internet or alternative IP solution may be a better answer. VPNs represent a secure and cost-effective alternative to a dedicated network, making it possible to interconnect geographically dispersed corporate LANs and WANs using a low-cost public network infrastructure. Currently, private line and frame relay represent the bulk of all WAN installations. Unfortunately, they are relatively inflexible, a problem in
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Figure 7-21 Traditional VPN.
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today s dynamic network environment. And because they are usually sold under a 3-to-5 year contract, they have become less attractive for customers who do not want to be locked into a network solution that cannot evolve with changing applications and geographic footprint requirements. The cost advantages of VPNs are significant. In addition to the savings that result from the elimination of distance charges and the costs of dial access, there are also savings from reductions in capital equipment and support. Because VPNs use a single WAN interface for multiple functions, the data that would normally have passed through several devices now requires one. Support costs are reduced because of the capability to consolidate all support functions within a single help desk organization. Of course, other challenges are associated with VPNs, not the least of which is performance. The Internet is not known for providing highly dependable QoS, and given that it constitutes the heart of the VPN, a number of questions arise. An ideal IP-based VPN would
Be ubiquitously available, secure, and reliable Offer a variety of network management and billing options
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