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D -72 Psion Teklogix 9160 G2 Wireless Gateway User Manual
Appendix D: Glossary
UTC
on another computer). The first part of the URL indicates what protocol to use and the
second part specifies the IP address or the domain name where that resource is located.
For example,
ftp://ftp.devicescape.com/downloads/myfile.tar.gz
specifies a file that should be fetched
using the FTP protocol;
http://www.devicescape.com/index.html
specifies a Web page that should
be fetched using the HTTP protocol.
UTC
Coordinated Universal Time (UTC) is also known as Greenwich Mean Time.
V
VLAN
A virtual LAN (VLAN) is a software-based, logical grouping of devices on a network that
allow them to act as if they are connected to a single physical network, even though they
may not be. The nodes in a VLAN share resources and bandwidth, and are isolated on that
network. The 9160 G2 Wireless Gateway supports the configuration of a wireless VLAN.
This technology is leveraged on the access point for the “virtual” guest network feature.
VPN
A Virtual Private Network (VPN) is a network that uses the Internet to connect its nodes. It
uses encryption and other mechanisms to ensure that only authorized users can access its
nodes and that data cannot be intercepted.
W
WAN
A Wide Area Network (WAN) is a communications network that spans a relatively large
geographical area, extending over distances greater than one kilometer. A WAN is often
connected through public networks, such as the telephone system. It can also be connected
through leased lines or satellites.
The Internet is essentially a very large WAN.