Wireless LAN (WLAN)

A wireless local area network (WLAN) links two or more devices using some wireless distribution method (typically spread-spectrum or OFDM radio), and usually providing a connection through an access point to the wider internet.

Wireless Internet Service Provider(WISP)

Wireless Internet Service Providers (WISPs) are Internet service providers with networks built around wireless networking.

WiMax

WiMAX is a wireless communications standard designed for creating metropolitan area networks (MANs).

Wide area Network (WAN)

WANs are not limited to a single location. Many wide area networks span long distances via telephone lines, fiber-optic cables, or satellite links.

T-1 Line

A T1 line refers to a specific type of copper or fiber optic telephone line that can carry more data than traditional telephone lines. The T-carrier line, as it is sometimes called, was developed by AT&T Bell Labs for North America and Japan.

Server Operating System

a server is an application, or device that performs services for connected clients as part of a client-server architecture. A server application, as defined by RFC 2616 (HTTP/1.1), is "an application program that accepts connections in order to service requests by sending back responses." Server computers are devices designed to run such an application or applications, often for extended periods of time with minimal human direction. Examples of d-class servers include web servers, e-mail servers, and file servers.

Server

a server serves information to computers that connect to it.

Router

A router acts like a coin sorting machine, allowing only authorized machines to connect to other computer systems.

Public Switched Telephone Network (PSTN)

The Public Switched Telephone Network (PSTN), also known as Plain Old Telephone Service (POTS), is the wired phone system over which landline telephone calls are made.

Proxy Server

A proxy server improves Internet access speeds from a network primarily by using a caching system. Caching saves recently viewed Web sites, images, and files on a local hard drive so that they don't have to be downloaded from the Web again.

Peer-Peer Network

Peer to peer is an approach to computer networking where all computers share equivalent responsibility for processing data.

Node

A node can also refer to a leaf, which is a folder or file on your hard disk.

Modem

A modem is a communications device that can be either internal or external to your computer. It allows one computer to connect another computer and transfer data over telephone lines.

Local Area Conector (LAN)

A LAN is a computer network limited to a small area such as an office building, university, or even a residential home.

Intranet

Intranet is an internal or private network that can only be accessed within the confines of a company, university, or organization.

Internet

Data that travels long distances on the Internet is transferred on huge lines known collectively as the Internet backbone.

Hub

This is a hardware device that is used to network multiple computers together. It is a central connection for all the computers in a network, which is usually Ethernet-based

Hacker

While this term originally referred to a clever or expert programmer, it is now more commonly used to refer to someone who can gain unauthorized access to other computers.

Firewall

. A computer firewall limits the data that can pass through it and protects a networked server or client machine from damage by unauthorized users.

Extranet

An extranet actually combines both the Internet and an intranet. It extends an intranet, or internal network, to other users over the Internet.

Digital Subscriber Line (DSL)

It is medium for transferring data over regular phone lines and can be used to connect to the Internet. However, like a cable modem, a DSL circuit is much faster than a regular phone connection, even though the wires it uses are copper like a typical phone line.

Communication Channels

In telecommunications and computer networking, a communication channel, or channel, refers either to a physical transmission medium such as a wire,

Client/ Server Network

Client/server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request.

Client

In the real world, businesses have clients. In the computer world, servers have clients. The "client-server" architecture is common in both local and wide area networks. For example, if an office has a server that stores the company's database on it, the other computers in the office that can access the datbase are "clients" of the server.

Cable Modem

A cable modem is used for connecting to the Internet and is much faster than a typical dial-up modem. While a 56K modem can receive data at about 53 Kbps, cable modems support data transfer rates of up to 30 Mbps. That's over 500 times faster. However, most ISPs limit their subscribers' transfer rates to less than 6 Mbps to conserve bandwidth

Biometric Security Measures

The analysis of human data using the fingerprints, facial patterns, eye retinas is termed as the Biometrics. Initially the applications of biometrics were focused only on the high end consumers like government, defense and airport security.