Modulation
-is a process of varing one or more properties of high frequency periodic waveform- carrier signal
-contains information to be transmitted.
-done in a similar fashion to a musician modulating a tone (a periodic waveform) from a musical instrument by varing its volume, timing and pitch.
-enable the carrier signal to transport the information in the modulation signal to some destination.
Demodulation
- is the act of extracting the original information bearing signal from a modulated carrier wave.
-used in connection with radio receivers, but many other systems use many kinds of demoulators.
-A demodulator is an electronic circuit (or computer program in a software defined radio) that is used to recover the information content from the modulated carrier wave.
Bandwidth
- a rate of data transfer, bit rate or throughput, measured in bits per second (bps)
-linear algebra, the width of the non zero terms around the diagonal of a matrix.
-describes the width of the convolution kernel used
-a normative expected range of linguistic behaviour in language expectancy theory.
TCP/IP
-a model which a description framework for computer network protocols created in the 1970s by DARPA
-evolved from ARPANET which was the world first wide area network and a predecessor of the Internet.
- can be called as Internet model or the DoD Model
-describes a set of general design guidelines and implementations of specific networking protocols
-provides end to end connectivity specifying how data should be formatted, transmitted, routed and received at the destination.
Node
-in Latin node pronouced as nodus, 'knot'
-a connection point, either a redistribution point or a communication endpoint (some terminal equipment).
-definition of a node depends on the network and protocol layer referred to.
- a physical network node is an active electronicdevice that is attached to a network, and is capable of sending, receiving or forwarding information over a communications channel.
Client
- an application or system that accesses a remote service on another computer system
-known as a server , is the way of a network
-first appled todevices that were not capable of running their own stand alone programs.
-able to interact with remote computers via a network
-can run on the same machine and connect via Unix domain sockets.
-might connect to a service operating on a possibly remote system through the Internet protocol suite.
Server
- a server application, operating system, computer or applicance
Examples:
- Application server, a server dedicated to running certain software applications
- Catalog server, a central search point for information across a distributed network
- Communication server, carrier grade computing platform for communications networks
- Database server, provides database services to other computer programs or computers
- File server, provides file services
Network Operating System
- is referred to as the Dialoguer which is the software that runs on a server
-enables the server to manage data, users, groups, security, applications and other networking functions.
-designed to allow shared file and printer access among multiple computers in a network, typically a (LAN)
-Examples of NOS - Microsoft Winows Server 2003, Microsoft Windows Server 2008, UNIX and LINUX.
Network Administrator
-is a person responsible for the maintance of computer hardware and software that comprises a computer network.
-includes deploying, configuring, maintaing and monitoring active network equipment.
- is normally at the level of technical or network staff in organizations.
- will concentrate on the overall integrity of the network, server deployment, security, and ensuring that the network connectivity throughout a company's WAN infrastructure is on par with technical consideartions at the network level of an organization's hierachy.
0 comments:
Post a Comment