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MAC (Medium Access Control) Address:
A unique number that distinguishes net-
work cards.
Mbps (Mega Bits Per Second): A mea-
surement of millions of bits per second.
MDI/X (Media Dependent Interface/
Cross-over): Port on a network hub or
switch that crosses the incoming transmit
lines with the outgoing receive lines.
MHz (MegaHertz): One million cycles per
second.
MIB II: A database containing perfor-
mance information and statistics on each
device in a network.
MIPS (Million Instructions Per Second):
A measurement of processing speed.
NAT (Network Address Translation): An
internet standard that enables a LAN to
use one set of IP addresses for internal
trafc and a second set for external trafc.
NIC (Network Interface Card): An expan-
sion 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
network trafc based on its originating ad-
dress or its type.
PCI (Peripheral Component Intercon-
nect): A bus that is connected directly to
the CPU.
PCMCIA (Personal Computer Memory
Card International Association) Card:
Removable module that adds features to a
portable computer.
Ping (Packet Internet Groper): An In-
ternet utility used to determine whether a
particular IP address is online.
Glossary