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Appendix G: Glossary
10/100 16-Port VPN Router
OFDM
(Orthogonal Frequency Division Multiplexing) - A type of modulation technology that separates the data
stream into a number of lower-speed data streams, which are then transmitted in parallel. Used in 802.11a,
802.11g, and powerline networking.
Packet
- A unit of data sent over a network.
Passphrase
- Used much like a password, a passphrase simplifies the WEP encryption process by automatically
generating the WEP encryption keys for Linksys products.
Ping
(Packet INternet Groper) - An Internet utility used to determine whether a particular IP address is online.
POP3
(Post Office Protocol 3) - A standard protocol used to retrieve e-mail stored on a mail server.
Port
- 1. The connection point on a computer or networking device used for plugging in a cable or an adapter. 2.
The virtual connection point through which a computer uses a specific application on a server.
Power over Ethernet
(PoE) - A technology enabling an Ethernet network cable to deliver both data and power.
PPPoE
(Point to Point Protocol over Ethernet) - A type of broadband connection that provides authentication
(username and password) in addition to data transport.
PPTP
(Point-to-Point Tunneling Protocol) - A VPN protocol that allows the Point to Point Protocol (PPP) to be
tunneled through an IP network. This protocol is also used as a type of broadband connection in Europe.
Preamble
- Part of the wireless signal that synchronizes network traffic.
RADIUS
(Remote Authentication Dial-In User Service) - A protocol that uses an authentication server to control
network access.
RJ-45
(Registered Jack-45) - An Ethernet connector that holds up to eight wires.
Roaming
- The ability to take a wireless device from one access point's range to another without losing the
connection.
Router
- A networking device that connects multiple networks together, such as a local network and the Internet.
RTS
(Request To Send) - A packet sent when a computer has data to transmit. The computer will wait for a CTS
(Clear To Send) message before sending data.
Server
- Any computer whose function in a network is to provide user access to files, printing, communications,
and other services.
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