A VPN is an umbrella term that refers to all the technologies enabling secure communications over the public Internet. VPN uses "tunnels" between two gateways to protect private data as it travels over the Internet. Tunneling is the process of encapsulating private IP packets into a public IPSec packet. Once the authentication and authorization between the VPN gateways is established, the tunnel is created and the users can send and receive data across the Internet.
Types of VPN Connections
VPNs can be used to support the following types of connections:
Client to LAN. Used by mobile workers using dial-up Internet connections while on the road or ISDN, cable, or DSL connections from home. A single VPN tunnel is used for each VPN client.
LAN-to-LAN. A VPN can be used to link two LANs together using a single tunnel that handles all the secure data traffic between two locations.
Intranets. VPNs allow remote offices and users to securely access internal TCP/IP applications running on the corporate Intranet.
Extranets. VPNs enable secure access to the corporate Extranet for vendors, partners, and customers.
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