VIRTUAL PRIVATE NETWORK
A VPN is an enterprise network deployed on a shared infrastructure employing the same security and management policies applied in a private network.
VPNs are an alternative WAN infrastructure that replace or augment existing private networks that utilize leased-line or enterprise-owned Frame Relay/ATM networks.
VPNs can be separated into the following three categories:
Remote Access VPN connects telecommuters, mobile users, or even smaller remote offices with minimal traffic to the enterprise WAN and corporate computing resources.
Intranet VPN connects fixed locations, branch, and home offices, within an enterprise WAN.
Extranet VPN extends limited access of enterprise computing resources to business partners, such as suppliers or customers, enabling access to shared information.
Each type of VPN has different security and bandwidth management issues to consider.
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