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Glossary
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Gateway
A gateway is the system component that connects networks with completely different
architectures (addressing, protocols, application interfaces etc.). Although it is not
totally correct, the term is also used as a synonym for router.
See also Bridge, Hub, Router, Switch
Hub
A hub connects several network components in a star-shaped topology network by
sending all the data it receives from one network component to all the other network
components.
See also Bridge, Gateway, Router, Switch
IEEE
Institute of Electrical and Electronics Engineers
IEEE is an international body for defining network standards, especially for standardis-
ing LAN technologies, transmission protocols and speeds, and wiring.
IEEE 802.11
IEEE 802.11 is a standard for wireless 2.4-GHz and 5 GHz band LANs. In infrastructure
mode, terminals can be connected to a base station (access point) or connect with each
other spontaneously (Ad-hoc mode).
Infrastructure mode
Infrastructure mode is a way of operating wireless local networks (WLAN), in which an
access point handles the data traffic. Network components cannot establish a direct
connection with each other as is the case of ad-hoc mode.
Internet
The Internet is a wide-area network (= Wide Area Network), linking several million users
around the world. A number of protocols have been created for exchanging data, which
are known collectively as a TCP/IP stack. All participants on the Internet are identifiable
by an IP address. Servers are addressed by a domain name (e.g. siemens.com). Domain
Name Service (DNS) is used to assign domain names to IP addresses.
Among the most important Internet services are:
u
Electronic mail (email)
u
The World Wide Web (WWW)
u
File transfer (FTP)
u
Discussion forums (Usenet/Newsgroups)
Internet Service Provider
An Internet service provider offers access to the Internet for a fee.
