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Diagram of VPN (click to enlarge). Attribution to Ludovic.ferre.
A VPN allows a user who is outside of a corporate network to take a detour around the firewall and access the internal network from the outside. Through a combination of software and security measures, a VPN provides off-site access to the organization’s network while ensuring overall security. The Internet cloud is essentially an insecure channel through which people communicate to various web sites/servers. Implementing a VPN results in a secure pathway, usually referred to as a tunnel, through the insecure cloud, virtually guaranteeing secure access to the organization’s resources. The diagram represents security by way of the functionality of a VPN as it “tunnels” through the insecure Internet Cloud. Notice that the remote user is given access to the organization’s intranet, as if the user was physically located within the intranet.
Information Systems for Business and Beyond (2019) pg. 129
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