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. |
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. |
LAN: | Local Area Network (LAN) is a computer network that spans a |
| relatively small area. A system of LANs connected is called a wide area |
| network (WAN). |
MAC Address: | Media Access Control Address (MAC) is a hardware address that |
| uniquely identifies each node of a network. |
NAT: | Network Address Translation (NAT) is a routing protocol that allows |
| global IP Addresses to be translated into multiple private IP Addresses |
| for use on internal LAN networks. The explosion in the use of the |
| Internet has created a critical problem for the Internet Assigned Numbers |
| Authority (IANA) which is in charge of assigning IP Addresses to |
| Internet users, ISPs etc. NAT is a technology that has been introduced to |
| help maximize the utilization of assigned IANA and global IP Addresses. |
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