Computer Data Communications Test Online

Mustansar KhanLast Updated: October 15, 2025

Important Computer Data Communications Question and Answer

Total Questions:	55
Time Allowed:	25 Minutes
Total Marks:	55
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

Computer Data Communications Practice Test Online With Explanation

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Page 1 of 3

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1. What is encapsulation in data communication?

Wrapping data with protocol information

Converting analog to digital

Encrypting data

Compressing data

2. What is latency in a network?

Time delay between request and response

Encryption method

Total number of users

Speed of signal

3. Which signal representation is better for noise resistance?

Sine

Linear

Digital

Analog

4. What does baud rate represent?

Number of signal changes per second

Voltage level

Number of packets sent

Speed of sound

5. Which type of communication uses light signals?

Satellite

Fiber optic

Microwave

Radio

6. Which of these is a symmetric encryption algorithm?

AES

RSA

ECC

DSA

7. What does modulation mean?

Encrypting signals

Compressing data

Deleting data

Changing a signal to carry data

8. In which mode can data travel in both directions but only one at a time?

Full-duplex

Uniplex

Simplex

Half-duplex

9. Which method is used to represent characters in binary?

ASCII

HTTP

JPEG

10. What is the main advantage of digital communication over analog?

Lower cost

Better noise resistance

Faster speed

Shorter range

11. Which term is used when multiple devices transmit over a single channel?

Multiplexing

Switching

Modulation

Repeating

12. What is data communication?

The use of a phone to talk to someone

Printing data on paper

The transfer of books between libraries

The transmission of data between devices

13. Which of the following defines the route that data takes from source to destination?

Routing

Encoding

Compression

Modulation

14. Which device is used to prevent data packet loops in a network?

Modem

Repeater

Hub

Switch with Spanning Tree Protocol

15. Which method is used for collision detection in Ethernet?

DNS

TCP/IP

CSMA/CD

SMTP

16. What does bandwidth refer to in communication?

Frequency strength

Range of frequencies available for data transmission

Number of devices connected

Signal voltage

17. Which of the following represents a digital signal?

Continuous wave

Sine wave

Discrete binary values

Frequency shift

18. Which of these is a guided transmission medium?

Wi-Fi

Bluetooth

Infrared

Coaxial cable

19. Which of the following data transmission methods sends data one bit at a time?

Duplex

Analog

Parallel

Serial

20. Which of the following is an example of a transmission medium?

CPU

Excel

Printer

Cable

21. Which of the following uses radio waves for communication?

Coaxial Cable

Optical Fiber

Ethernet

Bluetooth

22. Which of these refers to communication in both directions simultaneously?

Simplex

Half-duplex

Unidirectional

Full-duplex

23. What is attenuation in data communication?

Loss of signal strength over distance

Increase in bandwidth

Strengthening of network security

Amplification of signals

24. What is handshaking in communication?

Encrypting data

Disconnecting a device

Exchange of signals to establish communication

Logging out of the system

25. Which type of transmission uses multiple data signals on one channel?

Full-duplex

Multiplexing

Baseband

Bandwidth

Page 2 of 3

26. In which layer of the OSI model are routers primarily used?

Data Link

Transport

Physical

Network

27. Which layer of the OSI model is responsible for end-to-end communication and error recovery?

Transport

Network

Data Link

Session

28. Which of the following is an example of simplex communication?

Video call

Walkie-talkie

Keyboard to CPU

Telephone

29. Which of the following is an example of unguided transmission media?

Infrared

Coaxial cable

Twisted pair cable

Fiber optic cable

30. What is the purpose of the Session Layer in the OSI model?

Modulating signals

Error detection

Managing connections between applications

Data routing

31. Which unit is used to measure frequency?

Watt

Volt

Ohm

Hertz

32. What does protocol mean in data communication?

The time taken to transmit data

A set of rules for data exchange

The type of cable used

A rule for playing games

33. Which device regenerates data to maintain signal strength?

Repeater

Hub

Switch

Modem

34. Which transmission media is immune to electromagnetic interference?

Coaxial cable

Twisted pair

Fiber optic cable

Telephone wire

35. Which layer of the OSI model handles error detection?

Network

Transport

Data Link

Application

36. What is jitter in data communication?

Variation in packet arrival time

Loss of data

Delay in data

Corruption of data

37. What is the full form of ISDN?

International Signal Distribution Network

Integrated Services Digital Network

Internet Speed Data Network

Internal Satellite Data Network

38. What type of signal is continuous in nature?

Analog

Serial

Digital

Binary

39. What is the purpose of the OSI model in data communications?

To design operating systems

To manage computer memory

To define how software should look

To standardize network communication processes

40. What is a frame in data communication?

A unit of physical data transmission

A power supply

A type of storage

A programming error

41. Which of the following ensures that data is sent at a rate the receiver can handle?

Routing

Flow control

Bandwidth management

Error detection

42. What is the purpose of error correction?

To compress data

To avoid hacking

To increase speed

To detect and fix data transmission errors

43. What does CRC stand for in data communication?

Cyclic Redundancy Check

Circuit Routing Code

Channel Resource Control

Code Repetition Check

44. Which of the following uses synchronous transmission?

TV remote

Keyboard input

Mouse movement

File transfer over internet

45. Which device helps increase signal strength over long distances?

Repeater

Hub

Router

Switch

46. Which of these is not a feature of data communication?

Accuracy

Delivery

Timeliness

Noise

47. What type of network topology is best for minimizing data collision?

Mesh

Ring

Star

Bus

48. What is the function of a parity bit?

Encrypts messages

Enhances speed

Controls routing

Checks data accuracy

49. What is the unit for measuring data transmission speed?

Bits per second

Hertz

Volt

Ohm

50. Which communication method uses frequency range for data transmission?

Bus

Broadband

Bandpass

Baseband

Page 3 of 3

51. Which device converts digital signals to analog and vice versa?

Router

Switch

Modem

Repeater

52. Which device connects two different networks?

Switch

Bridge

Router

Modem

53. Which of the following is not a type of data communication?

Half-duplex

Multiplex

Simplex

Full-duplex

54. Which of the following is a common cause of data communication errors?

Background apps

Noise and interference

High CPU usage

Short cables

55. Which type of multiplexing combines signals based on frequency?

Code Division Multiplexing

Bit Division Multiplexing

Frequency Division Multiplexing

Time Division Multiplexing

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Mustansar KhanLast Updated: October 15, 2025

Important Computer Data Communications Question and Answer

Computer Data Communications Practice Test Online With Explanation

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