Specifications

103
Glossary
Gigaset SX761 dsl / eng / A31008-M707-R111-2x-7619 / glossary.fm / 06.10.2008
Schablone 2005_07_27
DHCP server
See DHCP
DMZ
Demilitarised Zone
DMZ describes a part of a network that is outside the Firewall. A DMZ is set up, as it
were, between a network you want to protect (e.g. a LAN) and a non-secure network
(e.g. the Internet). A DMZ is useful if you want to offer Server services on the Internet
that are not to be run from behind the firewall for security reasons or if Internet appli-
cations do not work properly behind a firewall. A DMZ permits unrestricted access from
the Internet to only one or a few network components, while the other network com-
ponents remain secure behind the firewall.
DNS
Domain Name System
DNS permits the assignment of IP addresses to computers or Domain names that are
easier to remember. A DNS server must 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 name server. This in turn knows
all the addresses of the PCs in the local network and the superordinate name servers,
which again know addresses or the next superordinate name servers.
DNS server
See DNS
Domain name
The domain name is the reference to one or more Web servers on the Internet. The
domain name is mapped via the DNS service to the corresponding IP address.
DoS attack
Denial of Service
A DoS attack is a particular form of hacker attack directed at computers and networks
with a connection to the Internet. The aim is not so much to steal data but to paralyse
the computer or network so severely that the network resources are no longer available.
A typical hacker attack involves making a remote computer announce that it is acting for
the paralysed computer, for example, and receive the data intended for you.
DSL
Digital Subscriber Line
DSL is a data transfer technique in which a connection to the Internet can be run at high
speed over normal telephone lines. A DSL connection is provided by an Internet service
provider. It requires a DSL modem.