FRITZ!WLAN Repeater N/G
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Glossary
entered by a user and inquires about the corresponding IP
address at a DNS server known to the service. If a DNS
server cannot answer the inquiry itself, it can inquire
about the IP address (DNS resolution) at other DNS serv-
ers.
If the Domain Name Service receives negative information
from the DNS server (domain name not known), it can
send inquiries to other DNS servers it knows or return a
corresponding error message to the user. If it receives the
desired IP address instead, the application can use the IP
address to retrieve the destination desired by the user.
This hierarchical system of DNS servers is known as the
Domain Name System. The addresses of the DNS servers
at which the Domain Name Service is to inquire by default
generally are handed over to the computer by the Internet
Service Provider automatically whenever a connection to
the Internet is established. In local networks addresses
can also be assigned via DHCP. Otherwise they must be
entered manually in the TCP/IP settings of the computer
by the user or the system administrator.
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 combination of a DSL modem and a router is called a
DSL router.
Dynamic DNS
abbreviation for Dynamic Domain Name System
Dynamic DNS is a service which allows a computer always
to be reached under the same domain name despite con-
stantly changing IP addresses. This means that even pri-
vate users have an economical way of placing their own
Internet offers on their computer at home.
It works by transmitting the current IP address to a special
DDNS server each time the IP address changes. Except for
the few seconds between the cancellation of the old IP ad-
