Many large organizations have LANs that enable people within the organization to share
files. Although the LAN is connected to the Internet, most organizations install a firewall
to block Internet users from accessing information on the LAN.
Virtual Private Networking (VPN) provides a way for an authorized computer on the
Internet to tunnel through a firewall and connect to a computer on a LAN. To connect to a LAN through a firewall, the firewall must support Point-to-Point
Tunneling Protocol (PPTP), which lets VPN connect you through the firewall. Your
organization’s LAN administrator sets up a VPN server, the program on the LAN that
provides PPTP. Both the VPN client (the computer making the connection) and the
VPN server must have Internet connections.
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