1) VPN server:
A computer that accepts VPN connections from VPN clients.
2) VPN client:
A computer that initiates a VPN connection to a VPN server. A VPN client can be
an individual computer or a router.
3) Tunnel:
The portion of the connection in which your data is encapsulated.
4) VPN connection: The
portion of the connection in which your data is encrypted. For typical secure
VPN connections, the data is encrypted and encapsulated along the same portion
of the connection.
Note:
It
is possible to create a tunnel and send the data through the tunnel without
encryption. This is not a VPN connection because the private data is sent
across a shared or public network in an unencrypted and easily readable form.
5) Tunneling protocols: Protocols
that are used to manage tunnels and encapsulate private data. Data that is
tunneled must also be encrypted to be a VPN connection. The Windows
Server 2003 family includes the PPTP and L2TP tunneling protocols. For
more information, see Point-to-Point Tunneling Protocol and Layer
Two Tunneling Protocol.
6) Tunneled data: Data
that is usually sent across a private point-to-point link.
7) Transit internetwork: The
shared or public network crossed by the encapsulated data. For the Windows
Server 2003 family, the transit internetwork is always an IP internetwork.
The transit internetwork can be the Internet or a private IP-based intranet.
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