108
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 is easier for humans to read
hexadecimal numbers than binary numbers.
I
IEEE
Institute of Electrical and Electronic Engineers.
Intranet
This is a private network, inside an organization or company, that
uses the same software you will find on the public Internet. The
109
only difference is that an Intranet is used for internal usage only.
Internet
The Internet is a globally linked system of computers that are
logically connected based on the Internet Protocol (IP). The
Internet provides different ways to access private and public
information worldwide.
Internet
address
To participate in Internet communications and on Internet
Protocol-based networks, a node must have an Internet address
that identifies it to the other nodes. All Internet addresses are IP
addresses
IP
Internet Protocol is the standard that describes the layout of the
basic unit of information on the Internet (the
packet
) and also
details the numerical addressing format used to route the
information. Your Internet service provider controls the IP address
of any device it connects to the Internet. The IP addresses in your
network must conform to IP addressing rules. In smaller LANs,
most people will allow the DHCP function of a router or gateway
to assign the IP addresses on internal networks.
IP address
IP address is a 32-binary digit number that identifies each sender
or receiver of information that is sent in packets across the
Internet. For example 80.80.80.69 is an IP address, it is the closet
thing the Internet has to telephone numbers. When you “call” that
number, using any connection methods, you get connected to the
computer that “owns” that IP address.
ISP
Internet Service Provider, is a company that maintains a network
that is linked to the Internet by way of a dedicated communication
line. An ISP offers the use of its dedicated communication lines
to companies or individuals who can’t afford the high monthly
cost for a direct connection.
J