virtual private network

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or individual users with secure access to their organization's network. A virtual private network can be contrasted with an expensive system of owned or leased lines that can only be used by one organization. The goal of a VPN is to provide the organization with the same capabilities, but at a much lower cost.

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A VPN works by using the shared public infrastructure while maintaining privacy through security procedures and tunneling protocols such as the Layer Two Tunneling Protocol (L2TP). In effect, the protocols, by encrypting data at the sending end and decrypting it at the receiving end, send the data through a "tunnel" that cannot be "entered" by data that is not properly encrypted. An additional level of security involves encrypting not only the data, but also the originating and receiving network addresses.

Getting started with virtual private networks

To explore how VPNs are used in the enterprise, here are some additional resources:

Vista VPN setup guide, part 1: How to configure Windows Server 2008: Setting up a VPN is a complicated process that can yield great rewards. Learn how to properly set up and configure a VPN using Microsoft Vista and Windows 2008.

VPN deployment strategies and best practices: Do you want to deploy a VPN? View this webcast to learn the best tactics for the process, including how the technology can reduce business costs.

Virtual private networks for SMBs offer choices, security and value: VPNs are a useful tool for midmarket companies, as various factors have increased the number of remote workers. Learn more about the VPN options for midmarket companies.

What to expect from VPN setup and maintenance costs: VPNs have been around for a while, but they can be expensive and complex to set up. Get expert advice from Mike Chapple on VPN setup and maintenance costs before you decide to start the implementation process.

VPN setup requirements for Microsoft Exchange Server: Before setting up a virtual private network (VPN) to connect remote users to Microsoft Exchange Server, find out what VPN hardware and software is needed.

Learn more about VPN design

Do you have something to add to this definition? Let us know. Send your comments to techterms@whatis.com

More resources from around the web: - How Stuff Works explains how a VPN works. - VPN security: Hiding in plain sight, using network encryption - Building IPsec VPNs with Cisco routers - IPsec VPN clients

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