ACTUAL STUDY

I nternet is a network Applications that connecting a computer to any other computer anywhere of the world via dedicated Severs.  That means it is a global communication system where Computer Networks are introduced which uses TCP/IP . Internet carries a large set of Information that is shared and used by millions of people worldwide. With the help of internet people are able to send and receive any kind of information such as social networking, video, Messaging, Online forums, etc. The information exchange between network devices or other communications medium is governed by rule that can be set out in a technical  specification called PROTOCOL .  An internet protocol (IP) address is a numerical label that is assigned to every device participating on network . How its work Computer are connected to the internet as the  part of network .you can use modem or dail-up  connection to connect internet service provider (ISP).with the help of ISP you can connect  to th

 LAN       Local Area Network a group of computers connected within a  building or a campus  (Example of LAN may consist of computers located on a single floor or a building or it might link all the computers in a small company.               – Span office or building             – Single hop (shared channel) (cheap!)             –  User rates: 10 Mbps             – 1 Gbps E.g., Ethernet, Token rings, Apple-talk     MAN Metropolitan Area Network is a network System that covers area of a single city.  Usually , MAN Connects more than one LANs in a city Town  that covers a small geographical area then a WAN .                Example cable TV ,telephone companies .   Fig:   Metropolitan Area Network                                                                                                             WAN   A network consisting of computers of LAN's connected across a distance WAN can cover small to large distances, using different Top

Data communications refers to the exchange of data between two devices via some form of  transmission medium such as a wire cable. For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware (physical equipment) and software (programs). The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, ,jitter. 1. Delivery: The system must deliver data to the correct destination. Data must be received by the intended device or user and only by that device or user 2. Accuracy : The system must deliver the data accurately. Data that have been altered in transmission and left uncorrected are unusable.  3. Timeliness: The system must deliver data in a timely manner. Data delivered late are useless. In the case of video and audio, timely delivery means delivering data as they are produced, in the same order that they are produced, and witho