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Broadband Router User Guide
74
network device that automatically assigns an IP address to any device that requests
for it.
DNS
Domain Name System is an Internet service that translates domain names into IP
addresses. Since domain names are alphabetic, they're easier to remember. The
Internet however, is really based on IP addresses. Every time you use a domain name,
the DNS will translate the name into the corresponding IP address. For example, the
domain name www.network_camera.com might translate to 192.167.222.8.
E
Enterprise network
An enterprise network consists of collections of networks connected to each other over
a geographically dispersed area. The enterprise network serves the needs of a widely
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 10 Mbps (traditional Ethernet), 100 Mbps (Fast Ethernet), and
1,000 Mbps (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 unauthor-
ized 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 speci-
fied 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. It 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 hexadeci-
mal 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
Intranet
This is a private network, inside an organization or company that uses the same soft-
ware you will find on the public Internet. The only difference is that an Intranet is used