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such as a single DSL line, wireless device or cable modem. All the users over the Ethernet share a common
connection, so the Ethernet principles supporting multiple users in a LAN combine with the principles of PPP, which
apply to serial connections.
PPTP
Point-to-Point Tunneling Protocol. A new technology for creating Virtual Private Networks (VPNs), developed jointly
by Microsoft Corporation, U.S. Robotics, and several remote access vendor companies, known collectively as the
PPTP Forum. A VPN is a private network of computers that uses the public Internet to connect some nodes.
Because the Internet is essentially an open network, the Point-to-Point Tunneling Protocol (PPTP) is used to ensure
that messages transmitted from one VPN node to another are secure. With PPTP, users can dial in to their
corporate network via the Internet.
Plug and Play
A computer system feature that provides automatic configuration of add-ons and peripheral devices such as
wireless PC Cards, printers, scanners and multimedia devices.
Proxy server
Used in larger companies and organizations to improve network operations and security, a proxy server is able to
prevent direct communication between two or more networks. The proxy server forwards allowable data requests to
remote servers and/or responds to data requests directly from stored remote server data.
RADIUS
Remote Authentication Dial-In User Service. An authentication and accounting system used by many Internet
Service Providers (ISPs). When you dial in to the ISP you must enter your username and password. This
information is passed to a RADIUS server, which checks that the information is correct, and then authorizes access
to the ISP system.
Though not an official standard, the RADIUS specification is maintained by a working group of the IETF.
Range
Most Wi-Fi systems will provide a range of a hundred feet or more. Depending on the environment and the type of
antenna used, Wi-Fi signals can have a range of up to mile.
RJ-45
Standard connectors used in Ethernet networks. Even though they look very similar to standard RJ-11 telephone
connectors, RJ-45 connectors can have up to eight wires, whereas telephone connectors have only four.
Roaming
Moving seamlessly from one AP coverage area to another with no loss in connectivity.
Router
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