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mation between computers.
RADIUS (Remote Authentication Dial In User
Service): A server that issues authentication key to
clients.
RAM (Random Access Memory): Non-permanent
memory.
Repeater Hub: A device that collects, strengthens
and transmits information to all connected devices,
allowing the network to be extended to accommo-
date additional workstations.
RC4: The encryption algorithm that is used in WEP.
RJ-45 connector: An 8-pin connector used be-
tween a twisted pair cable and a data transmission
device.
ROM (Read Only Memory): Permanent memory.
Router: Device that can connect individual LANs
and remote sites to a server.
Roaming: The ability to use a wireless device while
moving from one access point to another without
losing the connection.
PCI (Peripheral Component Interconnect): A
bus that is connected directly to the CPU.
PCMCIA (Personal Computer Memory Card
International Association) Card: Remov-
able module that adds features to a portable
computer.
Ping (Packet Internet Groper): An Internet
utility used to determine whether a particular IP
address is online.
Plug and Play: Hardware that, once in-
stalled (“plugged in”), can immediately be
used (“played”), as opposed to hardware that
requires manual configuration.
PoE (Power over Ethernet): A mechanism
to send DC power to a device using a CAT5
Ethernet cable.
PPPoE (Point-to-Point Protocol over Ether-
net): A specification for connecting users on an
Ethernet line to the Internet through a common
broadband medium.
Protocol: A standard way of exchanging infor-
Glossary