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Dhcp, Modem, Mode – Siemens SE505 User Manual

Page 121: Dhcp server, Domain name

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Glossary

Gigaset SE505 dsl/cable / English / A31008-E505-B100-1-7619 / glossary.fm / 16.07.2003

DHCP
Dynamic Host Configuration Protocol
DHCP handles the automatic assignment of

IP addresses

to network components. It was

developed because in large networks – especially the

Internet

– 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

Clients

)

Dynamic IP addresses

from a defined

IP Pool Range

thus saving a great deal of

configuration work. It also allows address pools to 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 SE505 dsl/cable includes a DHCP Server and so it can automatically assign

IP addresses for the PC's on its local network. For specific PC's you can specify that their

IP addresses are never changed.
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

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

applications 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

components remain secure behind the firewall.
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 Name Server. This in turn knows

all the addresses of the computers in the local network and the next higher Name

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

. The

Domain name is mapped via the

DNS

service to the corresponding

IP address

.

DSL
Digital Subscriber Line
DSL is a data transmission technique in which a connection to the

Internet

can be run

at 1.5

Mbps

over normal telephone lines. A DSL connection is provided by an

Internet

Service Provider

. It requires a DSL modem.