Besides using virtual private networks for remote access, a VPN can also bridge two networks together. In this mode of operation, an entire remote network (rather than just a single remote client) can join a different company network to form an extended intranet. This solution uses a VPN server to VPN server connection.
Intranet / Local Network VPNs designs approaches by Swift Networks
Internal networks may also utilize VPN technology to implement controlled access to individual subnets within a private network. In this mode of operation, Swift Networks VPN clients connect to a VPN server that acts as the network gateway. This type of VPN does not involve any public network cabling. However, it allows the security benefits of VPN to be deployed inside an organization. This approach has become especially popular as a way for businesses to protect their WiFi local networks.