Computer Networks · Complete Question Bank

All Computer Networks Interview Questions

Practice the complete collection of Computer Networks interview questions including theory, coding, MCQs and real interview problems.

Total Questions: 130Topics: 14Complete interview preparation

Overview

Questions

130

Full database

Topics

Categorised

Difficulty

Mixed Levels

Easy Hard

All Computer Networks Interview Questions (130)

Scroll through every important Computer Networks question asked in real interviews. Includes MCQs, subjective questions, and coding prompts.

1. What best defines a computer network?

Difficulty: EasyType: MCQTopic: network fundamentals

A collection of independent computers connected to share resources and data
A single computer performing multiple operations
A group of printers sharing the same paper source
Only the Internet

A computer network connects two or more computing devices so they can exchange data, share resources, and communicate efficiently. Networks can be small like a home LAN or large like the Internet, but the basic goal remains collaboration and resource sharing.

Correct Answer: A collection of independent computers connected to share resources and data

2. Which network topology connects all devices to a single central device?

Difficulty: MediumType: MCQTopic: network fundamentals

Ring topology
Bus topology

Continue your preparation

Browse more Computer Networks questions, explore related subjects, or practice full interview sets to strengthen your preparation.

Computer Networks subject page•All subjects

Master Interviews Anywhere, Anytime

All Computer Networks Interview Questions

Overview

1. What best defines a computer network?

2. Which network topology connects all devices to a single central device?

Continue your preparation

3. How many layers are there in the OSI reference model?

4. Describe the layers of the TCP/IP model and compare it with the OSI model.

5. What is a protocol in computer networking?

6. Which of the following best describes a WAN (Wide Area Network)?

7. Explain the concept of encapsulation and decapsulation in networking.

8. Which statement correctly distinguishes between a MAC address and an IP address?

9. Differentiate between a switch and a router. When would you use each?

10. Which statement correctly explains the difference between bandwidth and latency?

11. Walk through how data flows from one computer to another across a network using the OSI model perspective.

12. Which device operates primarily at the Data Link layer of the OSI model?

13. Explain the client-server architecture and how it differs from peer-to-peer networking.

14. What is the primary function of the Physical Layer in the OSI model?

15. Which statement best describes an analog signal?

16. Why are digital signals often preferred over analog signals in modern networks?

17. Differentiate between guided and unguided transmission media with examples.

18. What is the main advantage of twisting wires in a twisted pair cable?

19. Explain how data is transmitted through a fiber-optic cable and mention its advantages.

20. What does 'bandwidth' mean in the context of data transmission?

21. What is attenuation and how can it be minimized in network transmission?

22. Which of the following can cause errors during data transmission?

23. What is modulation in data communication?

24. Differentiate between data rate and baud rate with an example.

25. Which of the following is NOT a common type of noise in communication systems?

26. Explain multiplexing and describe one type used in computer networks.

27. Which of the following is the main responsibility of the Data Link Layer?

28. What is framing and why is it needed in the Data Link Layer?

29. Which of these techniques is used for error detection?

30. In a simple parity check, what happens if the number of 1s in transmitted data is odd but the parity bit expects even parity?

31. Explain how the Hamming Code works for error detection and correction.

32. What is the purpose of flow control in the Data Link Layer?

33. In Stop-and-Wait ARQ, what happens after sending one frame?

34. Explain how the Sliding Window Protocol improves efficiency over Stop-and-Wait.

35. In Go-Back-N ARQ, what happens when a frame is lost during transmission?

36. How does Selective Repeat ARQ achieve higher efficiency than Go-Back-N?

37. Which media access method is used in traditional Ethernet to detect collisions?

38. What does the MAC address uniquely identify?

39. Describe the two sublayers of the Data Link Layer and their responsibilities.

40. What is the main function of the Network Layer in the OSI model?

41. What is an IP address used for in networking?

42. Compare IPv4 and IPv6 in terms of address structure and benefits.

43. Why is subnetting used in IP networks?

44. What does CIDR stand for and what problem does it solve?

45. Explain the difference between static and dynamic routing.

46. When does packet fragmentation occur in IP networks?

47. Which IP address class provides the largest number of hosts per network?

48. What is the role of a default gateway in IP networking?

49. What is the purpose of ICMP in IP networking?

50. What does the Address Resolution Protocol (ARP) do?

51. What is the function of the Time-to-Live (TTL) field in an IP header?

52. Given the IP address 192.168.10.0/26, calculate the number of subnets, hosts per subnet, and the valid range of the first subnet.

53. What is routing in computer networks?

54. Explain how the Distance Vector Routing algorithm works.

55. Which statement best describes the Link State Routing algorithm?

56. Which protocol uses hop count as its primary metric for routing?

57. Describe OSPF and explain how it differs from RIP.

58. What is the main purpose of the Border Gateway Protocol (BGP)?

59. What information does a routing table contain?

60. What does a default route (0.0.0.0/0) represent in a routing table?

61. What are routing loops and how can they be prevented?

62. What is 'Administrative Distance' in routing?

63. Which of the following is NOT commonly used as a routing metric?

64. What is hierarchical routing and why is it used in large-scale networks?

65. Explain the concept of network convergence in routing.

66. Which of the following best describes the main role of the Transport Layer?

67. Which statement correctly compares TCP and UDP?

68. Describe the TCP three-way handshake process.

69. Which field in the TCP header ensures that data is delivered in sequence?

70. Explain TCP flow control using the sliding-window mechanism.

71. What is the main goal of TCP congestion control?

72. During TCP’s slow-start phase, how does the congestion window (cwnd) grow?

73. Which feature is true for UDP but not for TCP?

74. What are port numbers and why are they important in transport-layer communication?

75. What triggers a retransmission in TCP?

76. Describe how a TCP connection is terminated.

Master Interviews
Anywhere, Anytime