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Glossary
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H
Headset
Combination of microphone and headphone. A headset makes handsfree talking more
comfortable. There are headsets available that are connected to the handset by a cable.
HTTP Proxy
Server via which the
Network subscribers
can process their Internet traffic.
Hub
Uses one
Infrastructure network
to connect several
Network subscribers
. All data
sent to the hub by one network subscriber is forwarded to all network subscribers.
See also:
Gateway
,
Router
.
I
IEEE
Institute of Electrical and Electronics Engineers
International body that defines standards in electronics and electro-technology, 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
.
Instant messaging
Service that uses a client program to allow chatting in real time, i.e. to send brief mes-
sages to other subscribers on the Internet.
Internet
Global
WAN
. A series of protocols have been defined for exchanging data, known by the
name TCP/IP.
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 responsible for addressing subscribers in a
Net-
work
using
IP addresses
and routes data from the sender to the recipient. IP determines
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 corresponding IP address to the domain name.
The IP address has four parts (decimal numbers between 0 and 255) separated by full
stops (e.g. 230.94.233.2).
