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Glossary 127
Out-of-band
Communications with a network device using
some medium other than the network itself.
P
Packet
An addressed segment of data transmitted on a
network.
Preamble
Data bits at the beginning of each block of data,
used for synchronization.
R
Repeater
LAN signal regenerator. An Ethernet hub is a
type of repeater.
S
Segment
Part of an Ethernet or other network on which all
traffic is common to all nodes. See ollision
Domain.”
SNMP
The Simple Network Management Protocol; an
industry-standard protocol for remotely moni-
toring and controlling network devices from a
Network Management System (NMS). SNMP re-
quests are usually transmitted using TCP/IP,
though other means are possible.
T
TCP/IP
Transmission Control Protocol/Internet Protocol;
a suite of transport and network layer communi-
cations protocols.