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Monday, October 19, 2009 @ 10:09 PM
Communication and Network
Twisted-pair
Twisted pair cabling is a type of wiring in which two conductors (the forward and return conductors of a single circuit) are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from Unshielded Twisted Pair (UTP) cables, and crosstalk between neighboring pairs. Coaxial Cable Coaxial cable, or coax, is an electrical cable with an inner conductor surrounded by a tubular insulating layer typically of a flexible material with a high dielectric constant, all of which are surrounded by a conductive layer (typically of fine woven wire for flexibility, or of a thin metallic foil), and finally covered with a thin insulating layer on the outside. Fiber-optic cable Fiber optic cable functions as a "light guide," guiding the light introduced at one end of the cable through to the other end. The light source can either be a light-emitting diode (LED) or a laser. Network Terms Node a physical network node may either be a data circuit-terminating equipment (DCE) such as a modem, hub, bridge or switch; or a data terminal equipment (DTE) such as a digital telephone handset, a printer or a host computer, for example a router, a workstation or a server. Client A client is an application or system that accesses a remote service on another computer system, known as a server, by way of a network. Server A server is an application running on a computer that delivers a service. For example, a web server will deliver web pages when requested by a browser (called client in this context). Among the many services provided by the Internet servers are World Wide Web, the domain name system, e-mail, FTP file transfer, chat and instant messaging, voice communication, streaming audio and video and online gaming. Hub A network hub or repeater hub is a device for connecting multiple twisted pair or fiber optic Ethernet devices together and thus making them act as a single network segment. Network Interface Cord (NIC) a NIC is also commonly referred to as a network adapter and is an expansion card that enables a computer to connect to a network such as a home network Network Operating System (NOS) A networking operating system is an operating system that contains components and programs that allow a computer on a network to serve requests from other computer for data and provide access to other resources such as printer and file systems. Host Computer Main or controlling computer connected to other computers or terminals to which it provides data or computing services via a network. Network Manager NetworkManager is a software utility aimed at simplifying the use of computer networks on Linux and other Unix-like operating systems. |
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