- 100 -
distributed
company
and
operates
the
company’s
mission
‐
critical
applications.
Ethernet
The
most
popular
LAN
communication
technology.
There
are
a
variety
of
types
of
Ethernet,
including
10Mbps
(traditional
Ethernet),
100Mbps
(Fast
Ethernet),
and
1,000Mbps
(Gigabit
Ethernet).
Most
Ethernet
networks
use
Category
5
cabling
to
carry
information,
in
the
form
of
electrical
signals,
between
devices.
Ethernet
is
an
implementation
of
CSMA/CD
that
operates
in
a
bus
or
star
topology.
F
Fast
Ethernet
Fast
Ethernet,
also
called
100BASE
‐
T,
operates
at
10
or
100Mbps
per
second
over
UTP,
STP,
or
fiber
‐
optic
media.
Firewall
Firewall
is
considered
the
first
line
of
defense
in
protecting
private
information.
For
better
security,
data
can
be
encrypted.
A
system
designed
to
prevent
unauthorized
access
to
or
from
a
private
network.
Firewalls
are
frequently
used
to
prevent
unauthorized
Internet
users
from
accessing
private
networks
connected
to
the
Internet,
especially
Intranets
all
messages
entering
or
leaving
the
intranet
pass
through
the
firewall,
which
examines
each
message
and
blocks
those
that
do
not
meet
the
specified
security
criteria.
G
Gateway
A
gateway
links
computers
that
use
different
data
formats
together.
Group
Groups
consist
of
several
user
machines
that
have
similar
characteristics
such
as
being
in
the
same
department.
H
HEX
Short
for
hexadecimal
refers
to
the
base
‐
16
number
system,
which
consists
of
16
unique
symbols:
the
numbers
0
to
9
and
the
letters
A
to
F.
For
example,
the
decimal
number
15
is
represented
as
F
in
the
hexadecimal
numbering
system.
The
hexadecimal
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