Siemens Simens Gigaset WLAN dsl/cable SE551 - Manual (Page 133)

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Glossary
Gigaset SE551 WLAN dsl/cable / ENG / A31008-M1029-B101-2x-7619 / glossary.fm / 17.11.2008
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Firewall
Firewalls are used by network operators as protection against unauthorised external
access. This involves a whole bundle of hardware and software actions and technologies
that monitor and control the data flow between the private network to be protected and
an unprotected network such as the
Internet .
See also NAT
Flat rate
Flat rate is a particular billing system for
Internet connections The Internet Provider
charges a monthly fee regardless of the duration and number of logins.
Full duplex
Data transmission mode in which data can be sent and received at the same time.
See also
Half duplex
Gateway
A gateway is a device for connecting 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 .
Global IP address
See
Public IP address
Half duplex
Operating mode for data transfer. Only one party can receive or send data at a time.
See also
Full duplex
HTTP Proxy
An HTTP proxy is a
Server that network components use for their Internet traffic. All
requests are sent via the proxy.
Hub
A Hub connects several network components in a star-topology network by sending all
the data it receives from one network component to all the other network components.
See also:
Switch , Bridge , Router , Gateway
IEEE
Institute of Electrical and Electronic Engineers
The IEEE is an international body for defining network standards, especially for stand-
ardising
LAN technologies, transmission protocols and speeds, and wiring.
IEEE 802.11
IEEE 802.11 is a standard for wireless LANs operating in the 2.4 GHz band. In so-called
Infrastructure mode , terminals can be connected to a base station ( Access Point ) or they
can connect with each other spontaneously ( Ad-hoc mode ).