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A router allows multiple computers to join the same network which provided several Ethernet ports for wired connections, most
modern routers offer wireless connectivity
as well. It provides access to a local network LAN; it does not necessarily
provide access to the Internet. In order to connect, the router must be connected
to a modem.
A modem is a device
that provides access to the Internet. It
connects to your ISP, which typically provides either cable or DSL Internet
service. Cable modems have a coaxial (or "coax") connection. DSL
modems have a telephone connector, also called an RJ-11 jack.
D-Link 
