Data Communication and Networking

DCN VIVA QUESTIONS 1. What do you mean by data communication? Ans: It is the exchange of data between two devices via some form of transmission medium such as wire cable. The communicating system must be part of a communication system made up of a combination of hardware and software. The effectiveness of a data communication system depends on three fundamental characteristics: delivery, accuracy and timeliness. 2. What is simplex? Ans: It is the mode of communication between two devices in which flow of data is unidirectional. i.e. one can transmit and other can receive. E.g. keyboard and monitor. 3. What is half-duplex? Ans: It is the mode of communication between two devices in which flow of data is bidirectional but not at the same time. ie each station can transmit and receive but not at the same time. E.g walkie-talkies are half-duplex system. 4. What is full duplex? Ans: It is the mode of communication between two devices in which flow of data is bidirectional and it occurs simultaneously. Here signals going in either direction share the capacity of the link. E.g. telephone 5. What is a network? Ans: It is a set of devices connected by communication links. A node can be a computer or any other device capable of sending and/or receiving data generated by other nodes on the network. 6. What is distributed processing? Ans: It is a strategy in which services provided by the network reside at multiple sites. 7. What is point to point connection? Ans:It provides a dedicated link between two devices. The entire capacity of the link is reserved for transmission between the two devices e.g. when we change the TV channels by remote control we establish a point to point connection between remote control and TV control system. 8. What is multipoint connection? Ans: In multipoint connection more than two specific devices share a single link. Here the capacity of the channel is shared either separately or temporally. 9. What is a topology?

Ans: Topology of a network