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Appendix C - Glossary
ADSL: Asymmetric Digital Subscriber Line (ADSL), as its name indicates, is an
asymmetrical data transmission technology with higher traffic rate
downstream and lower traffic rate upstream. ADSL technology satisfies
the bandwidth requirements of applications which demand asymmetric
traffic, such as web surfing, file downloads, and telecommuting.
Bandwidth: The amount of data that can be transmitted in a fixed amount of time.
DHCP: Dynamic Host Configuration Protocol (DHCP) is a protocol for
assigning dynamic IP Addresses to devices on a network. Dynamic
Addressing means that a device can have a different IP Address each time
it connects to the network.
DNS: Domain Name Server (DNS), translates domain names into IP Addresses.
To help us recognize and remember domain names they are alphabetic in
form, however, the Internet actually runs on numbered IP Addresses.
DNS servers translate domain names into their respective IP Addresses.
Ethernet: One of the most common Local Area Network (LAN) standards.
Ethernet uses a bus topology which supports a data transfer rate of 10
or 100 Mbps.
DMZ: In computer networks, a DMZ (demilitarized zone) is a computer host
or small network inserted as a "neutral zone" between a company's
private network and the outside public network. It prevents outside
users from getting direct access to a server that has company data. A
DMZ is an optional and more secure approach to a firewall and
effectively acts as a proxy server as well.
Domain Name: A name that identifies one or more IP Addresses. For example, the
domain name microsoft.com represents about a dozen IP Addresses.
Domain names are used in URLs to identify particular Web pages. For
example, in the URL http://www.pcwebopedia.com/index.html, the
domain name is pcwebopedia.com.
Firewall: A security system used to enforce an access control policy between an
organisation’s networks and the Internet.
Gateway: A gateway is a network point that acts as an entrance to another
network.
IPSec: Internet Protocol Security is a security standard for network
transmission, which is often used for VPN connections. It provides
authentication and packet encryption over the Internet.