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LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 1: Introduction
13
EN
In Germany, for instance, all T-DSL connections from Deutsche Telekom AG are
implemented as ADSL-over-ISDN connections.
1.2 What does VPN offer?
A VPN (Virtual Private Network) can be used to set up secure data communi-
cations over the Internet.
The following structure results when using the Internet instead of direct con-
nections:
All participants have fixed or dial-up connections to the Internet. Expensive
dedicated lines are no longer needed.
All that is required is the Internet connection of the LAN in the headquar-
ters. Special switching devices or routers for dedicated lines to individual
participants are superfluous.
The subsidiary also has its own connection to the Internet.
The RAS PCs connect to the headquarters LAN via the Internet.
The Internet is available virtually everywhere and typically has low access
costs. Significant savings can thus be achieved in relation to switched or ded-
icated connections, especially over long distances.
Headquarters
Computers using remote access
Internet
LAN
LAN
Branch office
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