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Ethernet The most popular LAN communication technolo
gy
.
There are a variet
y
of t
y
pes of Ethernet, includin
g
10
Mbps (traditional Ethernet), 100 Mbps (Fast Ethernet),
and 1,000 Mbps (Gi
g
abit Ethernet). Most Ethernet
networks use Cate
g
or
y
5 cablin
g
to carr
y
information,
in the form of electrical si
g
nals, 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 securit
y
, data
can be encr
y
pted. A s
y
stem desi
g
ned to prevent
unauthorized access to or from a private network.
Firewalls are frequentl
y
used to prevent unauthorized
Internet users from accessin
g
private networks
connected to the Internet, especiall
y
Intranets all
messa
g
es enterin
g
or leavin
g
the intranet pass throu
g
h
the firewall, which examines each messa
g
e and blocks
those that do not meet the s
p
ecified securit
y
criteria.
G
Gateway A
g
atewa
y
links computers that use different data
formats together.
Group Groups consist of several user machines that have
similar characteristics such as bein
g
in the same
department.