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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 system is useful because it can represent
every byte (8 bits) as two consecutive hexadecimal digits. It