Glossary
90
840 USE 115 00 Version 1.0
OSI model
Open S
stem Interconnection model. A reference standard describin
the re
uired
performance of devices for data communication. Produced b
the International
Standards Or
anization.
packet
The unit of data sent across a network.
PING
Packet Internet Groper. A pro
ram used to test whether a destination on a network
can be reached.
port
An access point for data entr
or exit within a host usin
TCP services.
protocol
Describes messa
e formats and a set of rules used b
two or more devices to
communicate usin
those formats.
PLC
Pro
rammable Lo
ic Controller
repeater
A device that connects two sections of a network and conve
s si
nals between
them without makin
routin
decisions or filterin
packets.
router
A device that connects two or more sections of a network and allows information to
flow between them. A router examines ever
packet it receives and decides
whether to block the packet from the rest of the network or transmit it. The router
will attempt to send the packet throu
h the network b
the most efficient path.
server
Provides services to clients. This term ma
also refer to the computer on which the
service is based.
O
P
R
S
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