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the task for network administrators because the software keeps track
of IP addresses ra ther than requiring an administrator to manage the
task. This means a new computer can be added to a network without
the hassle of manually assigning it a unique IP address. DHCP
allows the specification for the service provided by a router, gateway,
or other network device that automatically assigns an IP address to
any device that requests one
DNS Domain Name System is an Internet service that translates domain
names in to IP addresses. Since domain names are alphabetic,
they're easier to remember. The Internet however, is really based on
IP addresses every time you us e 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 unauthorized
Internet users from acce ssing 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