Computer Data Communications Test Online

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Question 1

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

Answer

Application

Question 2

2. What does bandwidth refer to in communication?

Answer

Number of devices connected

Answer

Frequency strength

Answer

Range of frequencies available for data transmission

Answer

Signal voltage

Question 3

3. What does protocol mean in data communication?

Answer

The time taken to transmit data

Answer

A rule for playing games

Answer

The type of cable used

Answer

A set of rules for data exchange

Question 4

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

Answer

Half-duplex

Answer

Full-duplex

Question 5

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

Answer

Switch with Spanning Tree Protocol

Question 6

6. What is latency in a network?

Answer

Total number of users

Answer

Speed of signal

Answer

Encryption method

Answer

Time delay between request and response

Question 7

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

Answer

To design operating systems

Answer

To manage computer memory

Answer

To define how software should look

Answer

To standardize network communication processes

Question 8

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

Answer

Video call

Answer

Walkie-talkie

Answer

Keyboard to CPU

Question 9

9. What does modulation mean?

Answer

Deleting data

Answer

Encrypting signals

Answer

Changing a signal to carry data

Answer

Compressing data

Question 10

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

Answer

Full-duplex

Answer

Unidirectional

Answer

Half-duplex

Question 11

11. Which of the following uses synchronous transmission?

Answer

Keyboard input

Answer

File transfer over internet

Answer

Mouse movement

Question 12

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

Answer

Noise and interference

Answer

Background apps

Answer

High CPU usage

Answer

Short cables

Question 13

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

Question 14

14. Which of these is a guided transmission medium?

Answer

Coaxial cable

Question 15

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

Answer

Bits per second

Question 16

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

Question 17

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

Answer

Half-duplex

Answer

Full-duplex

Question 18

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

Question 19

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

Question 20

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

Answer

Error detection

Answer

Data routing

Answer

Managing connections between applications

Answer

Modulating signals

Question 21

21. What is a frame in data communication?

Answer

A programming error

Answer

A power supply

Answer

A type of storage

Answer

A unit of physical data transmission

Question 22

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

Question 23

23. What is the full form of ISDN?

Answer

Internal Satellite Data Network

Answer

Integrated Services Digital Network

Answer

Internet Speed Data Network

Answer

International Signal Distribution Network

Question 24

24. What is encapsulation in data communication?

Answer

Wrapping data with protocol information

Answer

Compressing data

Answer

Converting analog to digital

Answer

Encrypting data

Question 25

25. What is the purpose of error correction?

Answer

To detect and fix data transmission errors

Answer

To increase speed

Answer

To avoid hacking

Answer

To compress data

Question 26

26. Which device regenerates data to maintain signal strength?

Question 27

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

Answer

Shorter range

Answer

Faster speed

Answer

Better noise resistance

Answer

Lower cost

Question 28

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

Answer

Error detection

Answer

Bandwidth management

Answer

Flow control

Question 29

29. Which signal representation is better for noise resistance?

Question 30

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

Answer

Optical Fiber

Answer

Coaxial Cable

Question 31

31. What is the function of a parity bit?

Answer

Encrypts messages

Answer

Checks data accuracy

Answer

Controls routing

Answer

Enhances speed

Question 32

32. Which unit is used to measure frequency?

Question 33

33. Which type of communication uses light signals?

Answer

Fiber optic

Question 34

34. Which of these is a symmetric encryption algorithm?

Question 35

35. What does CRC stand for in data communication?

Answer

Code Repetition Check

Answer

Circuit Routing Code

Answer

Channel Resource Control

Answer

Cyclic Redundancy Check

Question 36

36. What is jitter in data communication?

Answer

Delay in data

Answer

Variation in packet arrival time

Answer

Corruption of data

Answer

Loss of data

Question 37

37. Which device connects two different networks?

Question 38

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

Answer

Multiplexing

Answer

Full-duplex

Question 39

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

Question 40

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

Question 41

41. What does baud rate represent?

Answer

Number of packets sent

Answer

Voltage level

Answer

Speed of sound

Answer

Number of signal changes per second

Question 42

42. Which transmission media is immune to electromagnetic interference?

Answer

Coaxial cable

Answer

Twisted pair

Answer

Fiber optic cable

Answer

Telephone wire

Question 43

43. What type of signal is continuous in nature?

Question 44

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

Question 45

45. What is handshaking in communication?

Answer

Exchange of signals to establish communication

Answer

Logging out of the system

Answer

Disconnecting a device

Answer

Encrypting data

Question 46

46. What is attenuation in data communication?

Answer

Amplification of signals

Answer

Increase in bandwidth

Answer

Strengthening of network security

Answer

Loss of signal strength over distance

Question 47

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

Question 48

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

Answer

Modulation

Answer

Compression

Question 49

49. What is data communication?

Answer

Printing data on paper

Answer

The transmission of data between devices

Answer

The use of a phone to talk to someone

Answer

The transfer of books between libraries

Question 50

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

Answer

Timeliness

Question 51

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

Question 52

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

Answer

Modulation

Answer

Multiplexing

Question 53

53. Which of the following represents a digital signal?

Answer

Discrete binary values

Answer

Continuous wave

Answer

Frequency shift

Question 54

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

Answer

Fiber optic cable

Answer

Coaxial cable

Answer

Twisted pair cable

Question 55

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

Answer

Code Division Multiplexing

Answer

Frequency Division Multiplexing

Answer

Time Division Multiplexing

Answer

Bit Division Multiplexing

Question 56

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Total Questions:	55
Time Allowed:	25 Minutes
Total Marks:	55
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Computer Data Communications Test Online

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Important Computer Data Communications Question and Answer

Computer Data Communications Practice Test Online With Explanation

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