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LAN (Local Area Network)
A privately owned and administered data communications network limited to a
small geographic area.
LED (Light Emitting Diode)
A light or status indicator that glows in response to the presence of the a certain
condition (e.g. an alarm)
Loopback (Line Loopback)
A test in which the received signal on the network interface is looped back to the
network without change.
NMS (Network Management System)
A computer system used for monitoring and controlling network devices.
NTU (Network Termination Unit)
The unit on the customer promises end of a link.
Packet
A piece of information sent over a network.
PAP (Password Authentication Protocol)
A security type that requires the remote end to identify itself by providing a host or
user name and password. This type of security does not use encryption.
PPP (Point-to-Point Protocol)
A method of connecting a computer to the Internet. PPP is more stable than the
older SLIP protocol and provides error checking features.
Protocol
A set of conventions that control the way that networks exchange information and
how equipment interoperates.
RFC (Request for Comments)
A series of notes about the Internet, started in 1969 (when the Internet was the
ARPANET). An RFC can be submitted by anyone. Eventually, if it gains enough
interest, it may evolve into an Internet standard.
Each RFC is designated by an RFC number. Once published, an RFC never
changes. Modifications to an original RFC are assigned a new RFC number.
Router
Routers use headers and a forwarding table to determine where packets go, and
they use ICMP to communicate with each other and configure the best route
between any two hosts.
Very little filtering of data is done through routers. Routers do not care about the
type of data they handle.
SNMP (Simple Network Management Protocol)
Simple Network Management Protocol, a set of protocols for managing complex
networks. SNMP works by sending messages, called protocol data units (PDUs),
to different parts of a network. SNMP-compliant devices, called agents, store data
about themselves in Management Information Bases (MIBs) and return this data to
the SNMP requesters.
Glossary
G-3
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