Data Communications Short Questions Series 1 Chapter 1
Concepts of Information Technology Short Questions Series 1 Chapter 1
Short questions with solved answers related to the concept of information technology. We provide students to prepare for their exams online. Reading short questions with answers is the best way to prepare their tests.
Q.1. Define data communication?
Ans: Data communication is a process of transferring data electronically from one place to another.
Data can be transferred by using different media. Data may consist of text, graphics and sound etc.
Q.2. Define signal and signaling?
Ans: An electromagnetic or light wave used to transmit data from one place to another is called a
signal. Propagation of signals across a communication medium is called signaling.
Q.3. List out different elements of data communication?
Ans: The basic elements of data communication are as follows:
Sender: Sender is a device that sends the message. It is also called source or transmitter.
Medium: Medium is the physical path that connects the sender and the receiver. It is used to transmit
Receiver: Receiver is a device that receives message. It is also called sink.
Transmission Medium: Transmission medium is the path through which the messages are transferred.
Protocol: A protocol is a set of rules that governs data communication. It represents an agreement
between communication devices.
Q.4. Differentiate between sender and receiver?
Ans: Sender is a device that sends the data message. It is also called source. Sender is normally a
computer. Receiver is a device that receives message. It can be computer, printer, or another computer
related device. The receiver must be capable of accepting the message.
Q.5. Define transmission modes?
Ans: The way in which data is transmitted from one place to another is called data transmission
modes. Simplex, half duplex and full duplex are modes of data transmission.
Q.6. Describe simplex mode of data transmission?
Ans: In simplex mode, data can flow only in one direction. It operates in a manner similar to a one-
Way street. The direction of flow never changes. A device with simplex mode can either send or receive
data. Traditional television broadcast is an example of simple mode.
Q.7. Describe half duplex mode of data transmission?
Ans: In half-duplex mode, data can flow in both directions but not at the same time. It is transmitted
one-way at one time. A device with half-duplex mode can send or receive data but not at the same time.
So, the speed of half-duplex mode is slow. Internet surfing is an example of half duplex transmission.
Q.8. Compare simplex and half duplex mode?
Ans: In simplex mode, data can flow only in one direction. Radio and television broadcasting are the
examples of this mode. In half-duplex mode, data can flow in both directions but not at the same time.
Q.9. What is analog and digital signal?
Ans: The analog signal is a variation in a smooth way over time e.g. speech. Analog signals can have
an infinite number of values in a range. Digital signal maintains a constant level then changes to
another constant level. e.g., binary 1’s and 0’s. Digital signals can have only a limited number of values.
Q.10. Write are two characteristics of analog signals?
Ans: Two characteristics of an analog wave are frequency and amplitude. The number of times a wave
repeats during a specific time interval is known as frequency. The height of wave within a given period
of time is known as amplitude.