A VPN is designed to provides a secure, encrypted tunnel in which to transmit the data between the remote user and the company network. The information transmitted between the two locations via the encrypted tunnel cannot be read by anyone else because the system contains several elements to secure both the company's private network and the outside network through which the remote user connects through.

A remote-access VPN uses a public telecommunication infrastructure like the Internet to provide remote users secure access to their organization's network. A VPN client on the remote user's computer or mobile device connects to a VPN gateway on the organization's network, which typically requires the device to authenticate its identity, then creates a network link back to the device that allows it to reach internal network resources (e.g., file servers, printers, intranets) as though it was on that network locally.

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