Data Communication MCQ with Answers pdf Notes Download

Data Communication MCQ with Answers pdf Notes Download. MCQ on Data Communication and Networking with Answers pdf for MCA, BCA, MSC IT, BSC IT Exams.

Data Communication MCQ with Answers

1. Define Computer Networks ___

Ans. A group of computers and other devices connected together s sharing resources is called Computer Network.

2. Networks make it easier to share expensive hardware and software. (True/False).
Ans. True

3. Which of the following Factors affects Response Time in Computer Network.
a) Number of Users
b) Transmission Speed
c) Media Type
d) All the above
Ans. d. All the above WAN

4. Which of the following is the major NOT the criteria that a Data Communication Network must meet.
a) Performance
b) Consistency
c) Reliability
d) Speed
Ans. Speed

5. Which type of network connects computers and resources together in a building or buildings close together?
Ans. LAN

6. Which type of networks t connects LANs together within a city?
Ans. MAN

7. Which type of Networks connects LANs together between cities or across a country?
Ans. WAN

8. Star topology requires less cable length than a linear topology. (True/False).
Ans. False

9. In bus topology it is difficult to identify the problem if the entire network shuts down. (True/False).
Ans. True

10. The entities comprising the corresponding layers on different machines are called ___.
Ans. Peer processes

11. In ___ communication type, data transfer occurs in only one direction.
Ans. Simplex

12. ___ communication type, data transfer occurs in either direction, but not simultaneously.
Ans. Half-duplex

13. ___ layer coordinates the functions required to carry a bitstream over a physical medium.
Ans. Physical Layer

14. ___ layer is responsible for the source-to-destination delivery of a packet, possibly across multiple networks.
Ans. Network Layer

15. ___ layer is responsible for the process-to-process delivery of the entire message.
Ans. Transport Layer

16. ___ signal completes a pattern within a measurable time frame called a period and repeats that pattern over subsequent identical periods.
Ans. Periodic

17. Attenuation is expressed in decibel because signal strengths often fall ___.
Ans. Logarithmically

18. ___ is caused due to the inductive coupling between two wires that is close to each other.
Ans. Crosstalk

19. Transmission impairment is one of the factors which determines the data rate and distance of the transmission medium. (True/False)
Ans. True

20. Twisted pair is designed to support voice traffic using digital signalling. (True/False)
Ans. False

21. The principal constraints on the performance of coaxial cable are ___, thermal noise, and intermodulation noise.
Ans. Attenuation

22. Which are the three concentric sections of optical fibre?
Ans. Core, cladding and jacket

23. If a composite signal contains frequencies between 1000 and 5000, its bandwidth ___.
Ans. 4000

24. Wavelength binds the period or the frequency of a simple sine wave to the ___ of the medium.
Ans. propagation speed

25. A composite signal can be periodic or nonperiodic. (True/False)
Ans. True

26. Mention three problems in transmission lines.
Ans. Attenuation, delay distortion and Noise

27. According to the sampling theorem sampling frequency fs must be greater than ___ of the maximum frequency fmax.
Ans. Twice

28. ___ is the process of converting digital data into digital signals.
Ans. Line coding

29. The bandwidth (range of frequencies) is proportional to the signal rate (baud rate). (True/False)
Ans. True

30. In the NRZ signal the signal return to zero at the end of the bit period. (True/False).
Ans. False

31. The Three subclasses of serial transmission are ___, ___ and___
Ans. Asynchronous, synchronous, and isochronous.

32. Parallel transmission can increase the transfer speed by a factor of ___over the serial transmission.
Ans. n

33. In real-time audio and video ___ transmission method is used.
Ans. Isochronous

34. In which encoding, the duration of the bit is divided into two halves where voltage remains at one level during the first half and moves to the other level in the second half.
a) NRZ-L
b) RZ
c) Manchester
d) AMI
Ans. c) Manchester

35. In the bipolar with 8-zero substitution (B8ZS) technique, eight consecutive zero-level voltages are replaced by the sequence ___.
Ans. 000VBOVB

36. Which are the three processes in PCM?
Ans. Sampling, Quantizing and encoding

37. If the signal as a maximum frequency of 20Khz what is the Nyquist rate for sampling?
Ans. 40khz

38. Gigabit Ethernet cannot use the Manchester encoding scheme because it involves a very high bandwidth. (True/False)
Ans. True

39. How delta modulation is different from PCM.
Ans. PCM finds the value of the signal amplitude for each sample; DM finds the change from the previous sample.

40. How Adaptive DM differs from DM.
Ans. In adaptive delta modulation, the value of δ changes according to the amplitude of the analog signal

41. Parity checking is effective in detecting a___ number of bit errors in a character
Ans. odd

42. How many numbers of bits in every character bit sequence are reserved for parity?
Ans. one

43. A perfect Hamming code exists for k =___
Ans. 2m– m – 1

44. The Hamming code can be converted to an SEC-DED code by adding ___ check bit.
Ans. one

45. The cyclic redundancy check, or CRC, is a technique for detecting errors in digital data, but not for making corrections when errors are detected. (True/False)
Ans. True

46. The CRC is like treating the message as a very large binary number and computing the remainder on dividing it by a fairly large prime. (True/False)
Ans. True

47. The ___ DLL translates the physical layer’s raw bitstream into discrete units (messages) called frames.
Ans. DLL

48. In character stuffing two-character sequence ___ to signal the beginning of a frame, and the sequence ___ to flag the frame’s end.
Ans. DLE STX (Data-Link Escape, Start of Text), DLE ETX (End of Text)

49. In bit stuffing use the 8-bit sequence of ___ also called a flag pattern to delimit consecutive frames.
Ans. “01111110

50. Which are the two approaches for flow control?
Ans. feedback-based flow control, rate-based flow control

51. ___ is concerned with ensuring that all frames are eventually delivered and possibly in order to a destination as they are sent from the source.
Ans. Error control

52. Stop and wait is a Full-duplex link protocol (True/False)
Ans. False

53. In Stop-and-Wait Automatic Repeat Request protocol adds a ___ to the stop-and-wait protocol.
Ans. The simple error control mechanism

54. In Stop-and-Wait Automatic Repeat Request ACK frame can also be corrupted and lost, it too needs ___ bits and a sequence number.
Ans. Redundancy

55. For m bits for the sequence number In Sliding window protocol the maximum size of the window is ___.
Ans. 2m – 1

56. The selective repeat protocol also uses two windows they are ___ window and the ___ window.
Ans. Send, receive

57. In Selective Repeat protocol, ___ are sent when data are delivered to the network layer.
Ans. ACK

58. State True (T) or False (F) and pick the right option.
i. Simplest protocol is a unidirectional protocol ii. In the Simplest protocol there is no need for flow control.
a) i-T, ii-T
b) i-F, ii-T
c) i-F, ii-F
d) i-T, ii-F
Ans. a) i-T, ii-T

59. HDLC can be used for ___ to ___ connections
Ans. Point, multipoint

60. HDLC frames can be transmitted over only synchronous links. (True/False).
Ans. False

61. The frame defined in HDLC is divided into a PDU at the ___ sub-layer.
Ans. LLC

62. What is the need for LLC?
Ans. The purpose of the LLC is to provide flow and error control for the upper-layer protocols that actually demand these services.

63. The Ethernet frame contains ___ fields.
Ans. Seven

64. An Ethernet frame needs to have a minimum length of ___ bits.
Ans. 512

65. Standard Ethernet uses ___ CSMA/CD.
Ans. 5.1-persistent

66. Slot time =___ + ___.
Ans. Round-trip time, Time required to send the jam sequence

67. All standard implementations use digital signalling (baseband) at ___.
Ans. 10 Mbps

68. 10Base-F uses a ___ topology to connect stations to a hub.
Ans. Star

69. A bridge divides the network into two or more networks (True/False)
Ans. True

70. 10Base5 and 10Base2 communication is ___.
a) half-duplex
b) full-duplex
c) full-simplex
d) simplex
Ans. a) half-duplex

71. In full-duplex switched Ethernet, there is no need for the CSMA/CD method (True/False)
Ans. True

72. ___ is added between the LLC sublayer and the MAC sublayer to provide flow and error control in full-duplex switched Ethernet.
Ans. MAC control

73. Fast Ethernet implementation at the physical layer can be Categorized as either ___.
Ans. Two-wire or four-wire

74. ___ was designed to use category 3 or higher UTP which uses four pairs of UTP for transmitting 100 Mbps.
Ans. 100Base-T4

75. OSPF supports three kinds of connection and networks.
a) Point to point lines b/w exactly two routers.
b) Multi-access networks with broadcasting.
c) Multi-access networks without broadcasting.
d) All of the above
Ans. d) All of the above

Data Communication and Networking MCQs with Answers: Set-1

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