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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
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 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).
Glossary
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