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Modulation

Modulation is when the signal is carried by an electronic or optical signal carrier. It is used to impress data, image, voice, etc on to a carrier wave for transmission. The form of modulation can think of blanket waving pass information to an certain area. It is used for most of radio get or pass the signal and information in the air. The common modulation are amplitude modulation, frequency modulation, and phase modulation. Amplitude modulation (AM), in which the voltage applied to the carrier is varied over time. Frequency modulation (FM), the frequency of the carrier of FM is varied in small but meaningful amounts. Phase modulation (PM) contain natural flow of the alternating current waveform.

Demodulation
Demodulation separates the original signal from the modulated carrier. A demodulator is an electronic circuit that used to produce a signal to alter and recover the modulated carrier wave. It is common used in connection with radio receivers, but many other systems use other different kinds of demodulators.

Bandwidth

Bandwidth is a term of computer networks. It transfer amount of data and information that can be carried from one point to another. It is usually given period of time (a second) to pass data in bits per second (bps).

TCP/IP

Computer use hardware-addresses to identify TCP/IP of each other's location. On worldwide network, the information are come from other computer. It makes it easier to find the resources over the internet. Every computer has its own IP address. It usually depend on where you are located. TCP/IP has its computer rules to cooperating computers of sharing information on internet works. The internet protocol controls where do you send your data to and where the data come from. There are also some program can hide your computer IP for your privacy.

Node

Node is basically anything that can connect to the computer network. I can be your computer, PDA's, smart phones, fax, or other network implements. Each node has its own IP address.

Client
A client is user that requesting program in a client/server. The user can open a Web browser to interact with the page from servers on the Web. The browser get and return the requests in HTML file.

Server

Server is a computer or device on network that handles the request and sends it back to the clients through the internet. Any user can store amount of files as a file server. The database sever processes the data and organize it in the server. A server basically is the program that manages the resources from the clients.

Network Operating Systems

Network operating systems allow users use computer to share information on multiple computers network. It is a software that runs on server and manages data, users groups, security, applications, and other networking functions.

Network Administrator

A network administrator is a person who maintains hardware and software of the computer network. Net work administrator is usually technical/network staff in an organization who is ensuring the network connectivity working normal.