chapter 9

Modulation
Demodulation
Bandwidth
TCP/IP
Node
Client
Server
Network Operating Systems
Network Administrator

• Modulation

Is a process of inflection high-frequency periodic waveform,in music it inflect the volume,pitch and sort to enable the signal to transport all the information in the modulation signal to a particular destination.

• Demodulation

Is a process to extracting the original content signal from a modulated signal.Commonly used in connection that relate to radio receivers and modem.

• Bandwith

Is a rate or amount of data that can be transfer in one time.

Usually expressed in bits/second,and also bytes/second.

It is really important for i/o devices.

• TCP/IP

Is a short term for Transmission Control Protocol/Internet Protocol.

It's a set of general guidelines that is used to provide specific networking protocols that enables communicating with the network.

It has a variety types of communication services between computers.

• Node

Node is a connection point or processing location.

It is different depends on the protocol layered and the networks.it can be either computer or other devices such as printers.Each node has it own unique network address.It's also can be use to recieve,send and forward informations over a communication channel.

• Client 

Is an application which access remote service on other computer.

usually applied to a device that cannot stand by their own and need a connection to a remote server to run.

• Server

Is a device on a network that work to manage the resources .

There are a lot of different type server:

File server:a computer that is used to storing data.can be use by any user to store file to the server.

Printer server:a computer that manage one or more printers.

base server:a computer which manage other computers in the same network.

• Network Operating System

NOS which is an operating system that has a special function to connect computers and devices to a local-area network  (LAN).

It enable the server to manage user,security,groups,data,application and also other functions.

• Network administrator

Is the person who is responsible to manage the maintenance of the computer hardware and software.

Network admin work in an situation which is not involving direct user support.

It's more focuses on the integrity of the workers,server deployment,and security

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