Siemens gigaset se551 User Manual

Gigaset SE551 WLAN dsl/cable / deutsch / A31008-M1029-B101-1-19 / glossary.fm / 25.10.2006

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DHCP
Dynamic Host Configuration Protocol
DHCP handles the automatic assignment of 

to network components. It was 

developed because in large networks – especially the 

 – the defining of IP 

addresses is very complex as participants frequently move, drop out or new ones join. 
A DHCP Server automatically assigns the connected network components (DHCP

 from a defined 

 thus saving a great deal of con-

figuration work. In addition, the address blocks can be used more effectively: since not 
all participants are on the network at the same time, the same IP address can be 
assigned to different network components in succession as and when required.
The Gigaset SE551 WLAN dsl/cable includes a DHCP server and uses it to assign auto-
matic IP addresses to PCs in the local network. You can specify that the IP addresses for 
certain PCs are never changed.

DHCP Server
See 

DMZ
Demilitarised Zone
DMZ describes a part of a network that is outside the 

. A DMZ is set up, as it 

were, between a network you want to protect (e.g. a 

) and an insecure network 

(e.g. the 

). A DMZ is useful if you want to offer 

services on the Internet 

which for security reasons are not to be run from behind the firewall 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 

 that are 

easier to remember. A DNS server must administer this information for each 

 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 superordinated Name Servers, 
which again know addresses and the next superordinated Name Servers. 

DNS server
See 

Domain name
The Domain name is the reference to one or more Web servers on the 

. 

The Domain name is mapped via the 

DNS

 service to the corresponding 

.