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Glossary
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Version 4, 16.09.2005
I
IEEE
Institute of Electrical and Electronics Engineers
International body that defines standards in
electronics and electrical engineering, con-
cerned in particular with the standardisation
of LAN technology, transmission protocols,
data transfer rate and wiring.
Infrastructure network
Network with central structure: All Network
subscribers communicate via a central
Router.
Internet
Global WAN. A series of protocols known as
TCP/IP have been defined for exchanging
data.
All Network subscribers are identifiable via
their IP address. DNS assigns a Domain
name to the IP address.
Important services on the Internet include
the World Wide Web (WWW), e-mail, file
transfer and discussion forums.
Internet Service Provider
Enables access to the Internet for a fee.
IP (Internet Protocol)
TCP/IP protocol on the Internet. IP is respon-
sible for addressing subscribers in a
Network using IP addresses and routes data
from the sender to the recipient. IP deter-
mines the paths (routing) along which the
data packets travel.
IP address
A unique address for a network component
within a network based on the TCP/IP proto-
cols (e.g., LAN, Internet). On the Internet,
domain names are usually assigned instead
of IP addresses. DNS assigns the correspond-
ing IP address to the domain name.
The IP address has four parts (decimal num-
bers between 0 and 255) separated by full
stops (e.g., 230.94.233.2).
The IP address is made up of the network
number and the number of the Network
subscriber (e.g., phone). Depending on the
Subnet mask, the first one, two or three
parts make up the network number and the
rest of the IP address addresses the network
component. The network number of all the
components in any one network must be
identical.
IP addresses can be assigned automatically
with DHCP (dynamic IP addresses) or manu-
ally (static IP addresses).
See also: DHCP.
IP pool range
Range of IP addresses that the DHCP server
can use to assign dynamic IP addresses.
L
LAN
Local Area Network
Network with a restricted physical range.
A LAN can be wireless (WLAN) and/or wired.
Local IP address
The local or private IP address is the address
for a network component in the local net-
work (LAN). The network operator can assign
any address he or she wants. Devices that act
as a link from a local network to the Internet
(gateway or router) have a public and a pri-
vate IP address.
See also IP address.
Local SIP port
See SIP port/local SIP port.
