Siemens 54 User Manual

Page 38

Glossary

Gigaset USB Adapter 54 / englisch / A31008-M1071-R101-1-7619 / glossary.fm / 01.12.2006

DNS
Domain Name System
DNS permits the assignment of IP addresses to computer or domain names that are
easier to remember. A DNS server has to administer this information for each LAN with
an Internet connection. As soon as a page on the Internet is called up, the 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 DNS Server. This in turn knows all
the addresses of the PCs in the local network and the next higher DNS Server, which
again knows addresses in its network and that of the next Name Server.
DNS Server
See DNS
Domain name
The domain name is the reference to one or more web servers on the Internet
(e.g. siemens.com). The domain name is mapped via the DNS service to the
corresponding IP address.
DSL
Digital Subscriber Line
DSL is a data transmission technology in which a connection to the Internet can be run
at up to 1.5 Mbps over normal telephone lines. A DSL connection is provided by an
Internet provider. It requires a DSL modem.
Dynamic IP address
A dynamic IP address is assigned to a network component automatically via DHCP.
This means that the IP address of a network component can change with every login or
at certain intervals.
See also Static IP address
Encryption
Encryption protects confidential information against unauthorised access. With an
encryption system data packets can be sent securely over a network.
Ethernet
Ethernet is the most widely-distributed network technology for local networks (LAN).
It was defined by IEEE as standard 802.3. Ethernet uses a base band cable for data
transmission with a transmission rate of 10 or 100 Mbps.
Gateway
A Gateway is the system component that connects networks with completely different
architectures (addressing, protocols, application interfaces etc.). Although it is not
totally correct, the term is also used as a synonym for router.
See also Bridge, Hub, Router, Switch