Appendix
B.3 Glossary
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Term
Definition
DHCP
The Dynamic Host Configuration Protocol (DHCP) is an auto- configuration
protocol used on IP networks. Computers or any network peripherals that
are connected to IP networks must be configured, before they can com-
municate with other computers on the network.
DHCP allows a computer to be configured automatically, eliminating the
need for a network administrator. DHCP also provides a central database to
keep track of computers connected to the network. This database helps in
preventing any two computers from being configured with the same IP
address.
DNS Server
A Domain Name System (DNS) server functions as a phonebook for the
Internet and Internet users. It converts human readable computer host-
names into IP addresses and vice-versa.
A DNS server stores several records for a domain name such as an ad-
dress 'A' record, name server (NS), and mail exchanger (MX) records. The
Address 'A' record is the most important record that is stored in a DNS
server, because it provides the required IP address for a network peripheral
or element.
DST
Daylight saving time (DST), also known as summer time, is the practice of
advancing clocks, so that evenings have more daylight and mornings have
less. Typically clocks are adjusted forward one hour near the start of spring
and are adjusted backward in autumn.
EAP
Extensible authentication protocol (EAP) refers to the authentication proto-
col in wireless networks that expands on methods used by the point-to-
point protocol (PPP), a protocol often used when connecting a computer to
the Internet. EAP can support multiple authentication mechanisms, such as
token cards, smart cards, certificates, one-time passwords, and public key
encryption authentication.
fixed wireless
Wireless devices or systems in fixed locations such as homes and offices.
Fixed wireless devices usually derive their electrical power from the utility
mains, unlike mobile wireless or portable wireless which tend to be battery-
powered. Although mobile and portable systems can be used in fixed loca-
tions, efficiency and bandwidth are compromised compared with fixed sys-
tems.
frequency allocation
Use of radio frequency spectrum regulated by governments.
frequency spectrum
Part of the electromagnetic spectrum.
hotspot
A WLAN node that provides Internet connection and virtual private network
(VPN) access from a given location. A business traveler, for example, with
a laptop equipped for Wi-Fi can look up a local hot spot, contact it, and get
connected through its network to reach the Internet and their own company
remotely with a secure connection. Increasingly, public places, such as
airports, hotels, and coffee shops are providing free wireless access for
customers.
IEEE 802.11 standards The IEEE 802.11 is a set of standards that are categorized based on the
radio wave frequency and the data transfer rate.
