Appendix D: Glossary
Appendix D: Glossary
The Glossary section defines the terms used in this User Manual
Term
Definition
Ethernet
Local Area Network technology, originally developed by Xerox
Corporation, can link up to 1,024 nodes in a bus network. Ethernet
provides raw data transfer in a rate of 10 megabits/sec. with actual
throughputs in 2 to 3 megabits/sec. using a baseband
(single-channel) communication technique. Ethernet uses carrier
sense multiple access collision detection (CSMA/CD) that prevents
network failures when two devices attempt to access the network at
the same time. LAN hardware manufacturers use Ethernet protocol;
their products may not be compatible.
Gateway
A computer that attaches to a number of networks and routes packets
between them. The packets can be different protocols at the higher
levels.
IP
Internet Protocol – The TCP/IP standard protocol defines the IP
datagram as the unit of information passed across a network.
IP Address
Internet Protocol Address – A 32-bit address assigned to hosts
participating in a TCP/IP network. The IP address consists of
network and host portions. It is assigned to an interconnection of a
host to a physical network.
MAC
Medium Access Control - The network layer between the physical and
the data link layers. Specifically, the physical (hardware) address
exists in this layer.
MIB
Management Information Base – The database, i.e. set of variables
maintained by a gateway running SNMP
NMS
Network Management Station
OID
Object Identifier – The variables defined in a MIB
Router
A computer that manages traffic between different network segments
or different network topologies. It directs the destination IP address.
The network media can be different, but the higher-level protocols
must be the same.
SNMP
Simple Network Management Protocol – A standard protocol used to
monitor IP hosts, networks, and gateways. SNMP defines a set of
simple operations that can be performed on the OIDs of the MIBs
managed by the monitored Agents. It employs the UDP/IP transport
layer to move its object between the Agents and the NMS
TCP/IP
Transmission Control Protocol/ Internet Protocol – A protocol suite
used by more than 15 million users with a UNIX association and
widely used to link computers of different kinds.
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