1. Computer Network & Data Transmission Mode Presented By:- Ankit Roll No. 05

2.  Computer Network is a group of computers which are connected with each other in order to share information and resources.  information and resources like voice, sounds, graphics, pictures, videos, text or data. Computer Network

3.  File Sharing:- It offer quick & easy way to share files directly. Instead of using a disk or USB to carry files from one computer or office to another.  Resource Sharing:- All computers in the network can share resources such as printers, fax machines, modems, and scanners.  Communication:- It offers various messaging services & chat room, so we can communicate with each other. Advantages of Computer Network

4.  Workgroup Computing: Workgroup software like Microsoft BackOffice enables many users to contribute to a document concurrently. This allows for interactive teamwork.  Flexible Access:- Networks allow their users to access files from computers throughout the network. Multiple users can also collaborate on the same project through the network. Cntd…

5.  If a network file server develops a fault, then users may not be able to run application programs.  A fault on the network can cause users to loose data.  If the network stops operating, then it may not be possible to access various resources. Disadvantages

6.  It is difficult to make the system secure from hackers, novices or industrial espionage.  As traffic increases on a network, the performance degrades unless it is designed properly.  Resources may be located too far away from some users.  The larger the network becomes, the more difficult it is to manage. Cntd…

7.  Local Area Network [LAN]  Metropolitan Area Network [MAN]  Wide Area Network [wan] Type of Networks

8.  When we connect several personal computers in a limited geographical area known as LAN.  It is privately owned networks that are the smallest among the available computer networks.  It has very low error rates & speed of transmission is 10 mbps to 16 mbps. Local Area Network

9.  Computer Network that usually spread across a campus or a city is known as MAN.  Man is a group of LANs located in a city that are connected through high-speed, within a metropolitan area.  For example, a company having buildinga across two sides of road. Metropolitan Area Network

10.  Wide Area Network covers a wide geographic area like state or country.  WAN helps connect multiple buildings or different offices of an organisation across different location in a city or across cities.  Communication in a WAN is done by telephone line, satellites dishes, and radio waves to span a large geographic area. Wide Area Network

11. Data can be transferred in three different main modes, which are –  Simplex  Half-Duplex  Duplex Data Transmission Mode

12.  In this mode, the communication is unidirectional means only one of the two devices on a link can transmit, other can only receive.  For example, from the computer to the printer & from all input devices (keyboard, mouse etc.). Simplex Mode

13.  In this mode, communication is bi-directional which means each station can transmit and receive, but not at the same time. When one device is sending, the other can only receive, and vice-versa.  For example, FAX (it can sends or receives letter but not in same time) Half-Duplex

14.  Where the communication is bi-directional & both sender & receiver can transmit and receive data simultaneously.  For example, FACEBOOK(you can transmit & receive message at a same time), Cell Phone & computer (download & up load files at same time). Duplex

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