Appendix C: Glossary
Appendix C: Glossary
The Glossary section defines the terms used in this User’s 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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