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Appendix C: Glossary
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Full Duplex - The ability of a networking device to receive and transmit data simultaneously.
Gateway - A device that interconnects networks with different, incompatible communications protocols.
Half Duplex - Data transmission that can occur in two directions over a single line, but only one direction at a time.
HTTP (HyperText Transport Protocol) - The communications protocol used to connect to servers on the World Wide Web.
IP (Internet Protocol) - A protocol used to send data over a network.
IP Address - The address used to identify a computer or device on a network.
MAC (Media Access Control) Address - The unique address that a manufacturer assigns to each networking device.
Mbps (MegaBits Per Second) - One million bits per second; a unit of measurement for data transmission.
Network - A series of computers or devices connected for the purpose of data sharing, storage, and/or transmission between users.
Packet - A unit of data sent over a network.
Port - The connection point on a computer or networking device used for plugging in cables or adapters.
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.
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.
Server - Any computer whose function in a network is to provide user access to files, printing, communications, and other services.
SMTP (
Simple Mail Transfer Protocol) - The standard e-mail protocol on the Internet.
SNMP (Simple Network Management Protocol) - A widely used network monitoring and control protocol.
Static IP Address - A fixed address assigned to a computer or device that is connected to a network.
Static Routing - Forwarding data in a network via a fixed path.
Subnet Mask - An address code that determines the size of the network.