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Glossary
Using a Virtual Private Network it is possible to use all net-
work applications of the company network even from distant
locations. This means it is possible to use the advantages of
the network even over large geographical distances.
VPN facilitates optimum information flow without delay
throughout the entire company, even to offices in other loca-
tions. E-mail servers, file sharing and other central applica-
tions of the company network can thus be made available via
VPN even to distant branch offices, subsidiaries and home of-
fices. With VPN, field representatives of a company can also
be granted secure access to the company network.
VoIP
short for for Voice over IP, also known as Internet telephony
Calls from the Internet are possible to and from the fixed-line
network and mobile networks. Various Internet Service Pro-
viders and telephony carriers provide SIP-fixed-line gateways
for this purpose. The gateways are used to produce voice con-
nections between the Internet and conventional telephone
networks.
In principle, VoIP calls can be made over any Internet connec-
tion. However, for convenient use with existing terminal de-
vices, and for conversations with the fixed-line and mobile
networks, it is important that the Internet Service Provider
support what is known as the SIP standard. SIP is the current
standard defined for VoIP by the IETF (Internet Engineering
Task Force).
WLAN
short for Wireless Local Area Network
The term WLAN designates the industry standard for wireless
local networks passed by the Institute of Electrical and Elec-
tronics Engineers (IEEE) in 1997 under the title IEEE 802.11.
By means of WLAN technology, individual computers or net-
work devices like printers or DSL access points can be linked
wirelessly to an existing cable-connected local network (LAN),
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