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Glossary
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DNS
D
omain
N
ame
S
ystem. DNS permits the assignment of IP addresses to PC or domain
names that are easier to remember. A DNS server must administer this information for
each local network with an Internet connection. As soon as a page on the Internet is
called up, the Web browser obtains the corresponding IP address from the DNS server
so that it can establish the connection.
On the Internet, the assignment of domain names to IP addresses follows a hierarchical
system. A local PC only knows the address of the local name server. This in turn knows
all the addresses of the PCs in the local network and the superordinated name servers,
which again know addresses and the next superordinated name servers.
Domain name
The domain name is the reference to one or more web servers on the Internet. The
domain name is mapped via the
service to the corresponding IP address.
Downlink
Files that your SE681 WiMAX receives and forwards to your local network.
DSL
D
igital
S
ubscriber
L
ine. DSL is a technique whereby data is transmitted via the conven-
tional phone line. To do this, you require suitable phone lines and special technology to
be set up by a
. As these preconditions are not satisfied in all areas, it is not
possible to use DSL in all locations. In order to make use of high-performance Internet
access in these areas as well, technologies such as WiMAX, Wi-Fi or satellite connec-
tions are implemented.
Ethernet
Ethernet is a network technology for local networks (LANs) defined by the
standard IEEE 802.3. Depending on the network adapter used, the transmission speed
on the Ethernet varies between 10
and 1 Gbps.
Firewall
Firewalls are used by network operators as protection against unauthorised external
access. This involves a whole bundle of hardware and software actions and technolo-
gies that monitor and control the data flow between the private network to be protected
and an unprotected network such as the Internet.
Firmware
Device software. To correct errors or update the device, a new firmware version can be
loaded onto the device's memory (firmware update).
Flat rate
Flat rate is a particular billing system for Internet connections. The
charges a
set monthly fee for a certain service package.
