Data Communications Short Questions and Answers

Data Communications Short Questions and Answers. This is the 1st post for ICS Part-I | 1st Year Computer Science Chapter No.3. The given short questions along with answers are important for the final exams.

We have tried our best to make the important short questions and answers from this chapter (Data Communications). This post covers the topics of data communications, components of data communications, encoder/decoder, signals (analog and digital), data representation, coding schemes (BCD, EBCDIC, ASCII, and Unicode), and simplex mode.

The maximum and possible short questions and answers of the remaining chapters will be published soon, so stay tuned for more short questions | MCQs | Online Test / Quiz.

Chapter No.3: Data Communications

Short Questions and Answers

Q.1: Define data communication?

Answer:

The transfer of data or information from one location to another is called data communication. In this process, data is sent from one location to another location using some form of transmission media.

 

Q.2: Write the components of data communication?

Answer:

There are five components in data communication, mentioned as under:

• Message or information
• Sender
• Receiver
• Communication channel
• Encoder and decoder

 

Q.3: Differentiate between encoder and decoder?

Answer:

The encoder converts digital signals to a form that can pass through transmission medium and decoder again converts the signal from the encoded form into digital form, which is understandable for the receiver.

 

Q.4: What are signals?

Answer:

The electromagnetic or light waves representing data are called signals. These are used to transfer data from one device to another device through the communication medium. Data communication signals can be in analog or digital form.

 

Q.5: Define analog signal?

Answer:

The analog data signals are continuous electrical signals in the form of waves. This wave is called a carrier wave. Two characteristics of analog carrier waves that can be altered are frequency and amplitude.

 

Q.6: Differentiate between frequency and amplitude?

Answer:

Frequency is the number of times a wave repeats during a specific time interval whereas amplitude is the height of wave within a given period of time.

 

Q.7: What is data representation?

Answer:

The computer works with binary numbers, binary means two digits. These are 0 and 1. An electrical pulse inside the computer represents each binary number. 1 is represented by a pulse of electrical inside the computer and 0 by an absence of a pulse. Each binary digit is called a bit and it is the smallest element of data.

 

Q.8: What is a coding scheme?

Answer:

A coding scheme for communications is a binary system, that is used in computer systems. The system consists of groups of bits that represent the character. Some codes use different numbers of bits such as 5,7,8 or 9 to represent that during data communication. BCD, EBCDIC, ASCII, and Unicode are examples of coding schemes.

 

Q.9: What is a BCD?

Answer:

BCD (Binary Coded Decimal) is 4 bits code. It is a system for converting decimal digits (0-9) into 4-bit binary numbers. In BCD, each digit of a decimal number is coded separately as a 4-bit (called nibble).

 

Q.10: What is an EBCDIC?

Answer:

EBCDIC (Extended Binary Coded Decimal) is an 8-bit character code. It is used on IBM mainframe operating systems.

 

Q.11: What is an ASCII?

Answer:

ASCII (American Standard Code of Information Interchange) is the most widely used coding system to represent data. It was developed by American National Standards Institute (ANSI). It can handle alphanumeric data. It is widely used for text files. It is a 7-bit code and makes 128 character combinations, whereas an 8-bit can make 256 combinations.

 

Q.12: What is a Unicode?

Answer:

Unicode (Universal Code) is a 16-bit code and can represent up to 65,536 characters and symbols. Unicode has backward compatibility. The first 256 characters in Unicode are the same ASCII characters.

 

Q.13: What is data communication mode?

Answer:

The direction of the flow of data between two communicating devices is called data communication mode. There are three different ways (modes) of flow of data communication i.e. Simplex mode, Half-duplex mode, and Full-duplex mode.

 

Q.15: Define Simplex Mode?

Answer:

In simplex mode, data is communicated in only one direction. A terminal can only send data and cannot receive it or it can only receive data but cannot send it. Radio broadcasting and TV transmission are examples of simplex mode communication.

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