Glossary
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This hierarchical system of DNS servers is known as the Do-
main Name System. The addresses of the DNS servers at
which the Domain Name Service is to inquire by default gen-
erally are handed over to the computer by the Internet Service
Provider automatically whenever a connection to the Internet
is established.
download
Download designates the transfer of files from the Internet to
a computer.
DSL modem
A DSL modem connects a computer to the Internet via the DSL
line. In contrast to the analog modem, a connection via the
DSL modem does not mean that the telephone line is busy.
DSL router
A DSL router generally combines three different devices: a
DSL modem (see glossary), a router, and a LAN switch.
A DSL router serves, first, to connect multiple computers or
other network devices together to form a local network (LAN)
so that the devices can exchange data with each other.
Second, a DSL router provides a central Internet connection
that can be used by all devices in the home network at the
same time. The DSL router’s job is to control the data traffic
between the local network and the Internet. If the DSL router
is equipped with a firewall (see glossary), it protects the de-
vices in the home network against attacks from the Internet.
DSL splitter
A DSL splitter is a device that separates telephone and DSL
signals.
You need a DSL splitter if you have a fixed line and a DSL line.
The splitter separates the telephone and DSL signals, which
use the same cable to access your house or apartment. The
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