Glossary
NAT (Network Address Translation): An inter- net standard that enables a LAN to use one set of IP addresses for internal traffi c and a second set for external traffi c.
NIC (Network Interface Card): An expansion card connected to a computer so the computer can be connected to a network.
Packet: A block of data that is transferred as a single unit, also called a frame or a block.
Packet Filtering: Discarding unwanted net- work traffi c based on its originating address or its type.
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 confi guration.
PoE (Power over Ethernet): A mechanism to send DC power to a device using a CAT5 Ethernet cable.
PPPoE
Protocol: A standard way of exchanging infor- mation between computers.
RADIUS (Remote Authentication Dial In User Service): A server that issues authentication key to clients.
RAM (Random Access Memory):
Repeater Hub: A device that collects, strength- ens and transmits information to all connected
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