Network • The collection of interconnected computers is called a computer network. • Two computers are said to be interconnected if they are capable of sharing and exchanging information.

Data Communication And Networking. Internet And its Service. Computer Security. Miscellaneous Question. CCC Study Materials Notes PDF Download in Hindi. Sandeep chaudhary January 28, 2018 at 1:58 am. Ignou bca project synopsis example. 15 communication system notes (english)Documents. Dos notes,disk operating system hindi notesEducation. Optical Communication System NotesDocuments. Operating system notes pdf Operating Systems. Operating system notes pdf anna university.

Need • Resource Sharing • Reliability • Cost Factor • Communication Medium Resource Sharing means to make all programs, data and peripherals available to anyone on the network irrespective of the physical location of the resources and the user. Reliability means to keep the copy of a file on two or more different machines, so if one of them is unavailable (due to some hardware crash or any other) them its other copy can be used.

Cost factor means it greatly reduces the cost since the resources can be shared Communication Medium means one can send messages and whatever the changes at one end are done can be immediately noticed at another. Evolution of Networking 1. ARPANET: In 1969, The US govt. Formed an agency named ARPANET (Advanced Research Projects Agency NETwork) to connect computers at various universities and defense agencies. The main objective of ARPANET was to develop a network that could continue to function efficiently even in the event of a nuclear attack. Internet (INTERconnection NETwork): The Internet is a worldwide network of computer networks. Bring it on gomez rar.

It is not owned by anybody. Interspace:InterSpace is a client/server software program that allows multiple users to communicate online with real – time audio, video and text chat in dynamic 3D environments.

SWITCHING TECHNIQUES Switching techniques are used for transmitting data across networks. Different types are: 1. Circuit Switching: In the Circuit Switching technique, first, the complete end-to-end transmission path between the source and the destination computers is established and then the message is transmitted through the path.

The main advantage of this technique is guaranteed delivery of the message. Mostly used for voice communication. Message Switching: In the Message switching technique, no physical path is established between sender and receiver in advance. This technique follows the store and forward mechanism. Packet Switching: In this switching technique fixed size of packet can be transmitted across the network. DATA COMMUNICATION TERMINOLOGIES Data channel:- The information / data carry from one end to another in the network by channel. Baud & bits per second (bps):- It’s used to measurement for the information carry of a communication channel.