What is a VPN
A VPN is private network constructed within a public network infrastructure, such
as the global Internet.
VPN is a private network that uses a public network (usually the
Internet) to connect remote sites or users together. a VPN uses "virtual"
connections routed through the Internet from the company's private network to
the remote site or employee.
A VPN (Virtual Private Network) is an enterprise network which
traverses a shared or
public infrastructure, like the Internet and establishes private
and secure connections over an
untrusted network, with geographically dispersed users, customers,
and business partners. A
VPN employs the same security and management policies as applied
in a private network.
Transport technologies which VPN solutions utilize are the public
Internet, service provider
IP backbones as well as service provider Frame Relay and ATM
networks.
A VPN is a communications environment in which access is controlled to permit
peer connections only within a defined community of interest, and is
constructed though some form of partitioning of a common underlying
communications medium, where this underlying communications medium provides
services to the network on a non-exclusive basis.
VPN’s
may be constructed to address any number of specific business needs or
technical requirements, a comprehensive VPN solution provides support for
dial-in access, multiple remote sites connected by leased lines (or other
dedicated means), the ability of the VPN service provider to “host” various
services for the VPN customers (e.g., web hosting), and the ability to support
not just intra-, but also inter-VPN connectivity, including connectivity to the
global Internet.
Features
needed in a well-designed VPN are Security, Reliability, Scalability, Network
management, Policy management.
VPN
technology allows an enterprise network to securely share information with
branch
offices,
telecommuters, mobile users, home users and business partners.
• Extend
geographic connectivity
• Improve security
• Reduce operational costs versus traditional WAN
• Reduce
transit time and transportation costs for remote users
• Improve
productivity
• Simplify
network topology
• global
networking opportunities
•
telecommuter support
• broadband
networking compatibility
• faster
ROI (return on investment) than traditional WAN