Wireless LAN (WLAN)

A wireless local area network (WLAN) links two or more devices using some wireless distribution method (typically spread-spectrumor OFDM radio), and usually providing a connection through an access point to the wider internet. This gives users the mobility to move around within a local coverage area and still be connected to the network. Source : http://en.wikipedia.org/wiki/Wireless_LAN 

Wireless Internet Service Provider (WISP)

Wireless Internet Service Providers (WISPs) are Internet service providers with networks built around wireless networking. Technology may include commonplace Wi-Fi wireless mesh networking, or proprietary equipment designed to operate over open 900MHz, 2.4GHz, 4.9, 5.2, 5.4, 5.7, and 5.8GHz bands or licensed frequencies in the UHF or MMDS bands. Source :http://en.wikipedia.org/wiki/Wireless_Internet_service_provider 

WiMaX

WiMAX is an IP based, wireless broadband access technology that provides performance similar to 802.11/Wi-Fi networks with the coverage and QOS (quality of service) of cellular networks. WiMAX is also an acronym meaning "Worldwide Interoperability for Microwave Access (WiMAX). Source: http://www.wimax.com/general/what-is-wimax\

Wide Area Network (WAN)

A wide area network (WAN) is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries).^[1]This is in contrast with personal area networks (PANs), local area networks (LANs), campus area networks (CANs), or metropolitan area networks (MANs) which are usually limited to a room, building, campus or specific metropolitan area (e.g., a city) respectively. Source:http://en.wikipedia.org/wiki/Wide_area_network 

T1 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.

Twisted copper telephone lines have been the standard for decades, transmitting voice and data via analog signals. Today that standard is slowly being upgraded to fiber optic lines, (lines made of bundled glass fibers), but most T1 lines are still made of twisted copper. The T1 line creates a "pipe" capable of blowing through larger data streams. Source: http://www.wisegeek.com/what-is-a-t1-line.htm

Server Operating System

A server operating system is software that was especially developed to serve as a platform for running multi-user computerprograms, applications that are networked and programs critical to business computing. This type of operating system (OS) often comes bundled with the most common types of applications deployed in the client-server model, a term used to indicate the exchange of information between computers. For example, a hypertext transfer protocol (HTTP) or web server hosts or "holds" the text files, images files and scripts that work together to form a website. When someone connects to the Internet and types in a web address, the server that holds the files of the site delivers or "serves" the requested pages to the client computer or the machine that made the request. Source: http://www.wisegeek.com/what-is-a-server-operating-system.htm

Server

A network server is a computer designed to process requests and deliver data to other (client) computers over a local network or the Internet.

Network servers typically are configured with additional processing, memory and storage capacity to handle the load of servicing clients. Source: 

http://compnetworking.about.com/od/basicnetworkingconcepts/g/network_servers.htm

Router

A router is a device in computer networking that forwards data packets to their destinations, based on their addresses. The work a router does it called routing, which is somewhat like switching, but a router is different from a switch. The latter is simply a device to connect machines to form a LAN. Source: 

http://voip.about.com/od/hardware/p/whatisarouter.htm

Public Switched Telephone Network (PSTN)

The public switched telephone network (PSTN) is the network of the world's public circuit-switched telephone networks. It consists of telephone lines, fiberoptic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables all inter-connected by switching centers which allows any telephone in the world to communicate with any other. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital in its core and includes mobile as well as fixed telephones.Source: http://en.wikipedia.org/wiki/Public_switched_telephone_network

Proxy Server

In computer networks, a proxy server is a server (a computer system or an application program) that acts as an intermediary for requests from clients seeking resources from other servers. Source: http://en.wikipedia.org/wiki/Proxy_server

Peer To Peer Network

A peer-to-peer, commonly abbreviated to P2P, is any distributed network architecture composed of participants that make a portion of their resources (such as processing power, disk storage or network bandwidth) directly available to other network participants. For example programs that we use today to download music on our computers "illegally" is with LimeWire, FrostWire, Ares, BiTorrent, Utorrent, etc. Source : http://en.wikipedia.org/wiki/Peer_to_peer_network

Node

 is a connection point, either a redistribution point or a communication endpoint (some terminal equipment). The definition of a node depends on the network and protocol layer referred to. A physical network node is an active electronic device that is attached to a network, and is capable of sending, receiving, or forwarding information over a communications channel. Source: http://en.wikipedia.org/wiki/Network_node

Modem

Modem, short for modulator-demodulator is an electronic device that converts a computer’s digital signals into specific frequencies to travel over telephone or cable television lines. At the destination, the receiving modem demodulates the frequencies back into digital data. Computers use modems to communicate with one another over a network. Source : http://www.wisegeek.com/what-is-a-modem.htm

Local Area Network (LAN)

A local area network (LAN) consists of two or more computers connected together in a building or home using software and hardware. A LAN is contrasted to a wide area network (WAN) such as the Internet, which covers a large geographic area. In aLAN, there is a main computer or server, and remote computers called clients. By creating a LAN in the home or office, computers on the LAN can share files, resources, and if desired, an Internet connection. Source : http://www.wisegeek.com/what-is-a-lan.htm

Intranet

a restricted computer network; a private network created using World Wide Web software. That means only authorized people can use this connection because it is private. That is used a lot today for example banks and other government companies that use this. Source: http://wordnetweb.princeton.edu/perl/webwn?s=intranet

Internet

a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange. It is basically the main thing used today now that we are in 2011 there is so much technology used every day. Basically everything is based on technology and the internet revolves a lot with that. Source: http://wordnetweb.princeton.edu/perl/webwn?s=internet

Hub

A hub is used in a wired network to connect Ethernet cables from a number of devices together. The hub allows each device to talk to the others. Hubs aren't used in networks with only wireless connections, since network devices such as routers and adapters communicate directly with one another.

Source: http://kb.netgear.com/app/answers/detail/a_id/233/~/what-is-a-hub%3F 

Hacker

Today, mainstream usage of “hacker” mostly refers to computer criminals, due to the mass media usage of the word since the 1980s. This includes what hacker slang calls “script kiddies,” people breaking into computers using programs written by others, with very little knowledge about the way they work. 

Firewall

A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications. It is a device or set of devices that is configured to permit or deny network transmissions based upon a set of rules and other criteria. Firewalls are thus a specialized type of router focusing on specific types of network security functions. 

Extranet

An extranet is a computer network that allows controlled access from the outside, for specific business or educational purposes.
Source :http://en.wikipedia.org/wiki/Extranet

Digital Subscriber Line (DSL)

DSL (digital subscriber line) technologies, often grouped under the term DSL, connect a computer to the Internet. DSL uses existing copper pair phone line wiring in conjunction with special hardware on the switch and user ends of the line. This special hardware allows for a continuous digital connection over the phone lines.

Source: http://kb.iu.edu/data/

Communication Channels

it is a pathway over which data are transferred between remote devices. It may refer to the entire physical medium, such as a telephone line, optical fiber, coaxial cable or twisted wire pair. That means that data transferred from computer to computer is the meaning to the communication channels thats how they transfer the information or data.

Source: http://www.answers.com/topic/communication-channels#

Client/Server Network

A client server network is defined as specific type of online network comprised of a single central computer acting as a server that directs multiple other computers, which are referred to as the clients. By accessing the server, clients are then able to reach shared files and information saved on the serving computer. Further, client server networks are very similar in nature to peer to peer networks with the exception that it is only the server that can initiate a particular transaction.

Source: What Is a Client Server Network? | eHow.com http://www.ehow.com/about_5542179_client-server-network.html#

Client

A client is an application or system that uses a remote service on another computer system, which is called a server, by way of a network 

Cable Modem

A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a HFC and R Fog infrastructure. Cable modems are primarily used to deliver broadband internet service in the form of cable internet, taking advantage of the high bandwidth of a HFC and RFoG network. They are commonly deployed in Australia, Europe, Asia and America's.

Biometric Security Measures

Biometrics consists of methods for uniquely recognizing humans based upon one or more intrinsic physical or behavioral traits. Incomputer science, in particular, biometrics is used as a form of identity access management and access control. It is also used to identify individuals in groups that are under surveillance.