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Introduction 13
IntroductionInstallationConfigurationInternet AccessLinking NetworksRemote AccessSending FaxesSecurity Introduction
What does a router do?
Note The following sections describe the functionality of routers in general. The
functions supported by your device are listed in the table “What can your
Business LAN R800+ do?” on page 18.
Routers connect LANs at different locations and individual PCs to form a Wide Area Net-
work (WAN). With the appropriate rights, any computer in this WAN can access other com-
puters and services of the complete WAN (as with 'PC 1' accessing 'Server A' in the remote
LAN in the diagram).
Connecting a LAN to the Internet does not technically differ from coupling two LANs. The
only difference is that it is not just a handful of computers behind the Internet provider's
router. Instead, it is the net of the networks - the public Internet.
Bridgehead to the WAN
All routers have at least two connections:
at least one for the LAN
at least one for WAN connections
In addition to LAN connectivity (10/100 Mbps Ethernet), several models also offer an inte-
grated switch. For the connecting to the WAN, the routers use ISDN, xDSL/cable or ADSL
connectors. Several devices contain additionally a wireless network card and can thus
integrate also stations of WLANs (Wireless LANs) into the routing.
The router's task is to transfer data from the local network to the target network via a suita-
ble WAN connection. Data is also transferred from the WAN to the desired recipients in the
LAN.
Areas of deployment for routers
Routers are mainly used for the following applications:
Internet access for a LAN (e.g. via DSL or ISDN)
router
LAN 1
PC 1
LAN 2
WAN connection
server A
router
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