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Data Communication Networking-II Multiple Choice Question & Answers

 

Data Communication Networking-II

Multiple Choice Question & Answers:-

 

1.There are ______________ Internet service providers.

 

    A) regional

    B) local

    C) national and international

    D) all of the above

 

2. ______ refers to the physical or logical arrangement of a network.

 

    A) Topology

    B) Mode of operation

    C) Data flow

    D) None of the above

 

3. A ______ is a data communication system spanning states, countries, or the whole world.

 

    A) MAN

    B) WAN

    C) LAN

    D) none of the above

 

4. A _______ connection provides a dedicated link between two devices.

 

    A) primary

    B) multipoint

    C) point-to-point

    D) secondary

 

5. Which topology requires a multipoint connection?

 

    A) Bus

    B) Star

    C) Mesh

    D) Ring

 

6. A ________ is a set of rules that governs data communication.

 

    A) protocol

    B) forum

    C) standard

    D) none of the above

 

7. In a ______ connection, two and only two devices are connected by a dedicated link.

 

    A) multipoint

    B) point-to-point

    C) (a) and (b)

    D) none of the above

 

8. The information to be communicated in a data communications system is the _______.

 

    A) Medium

    B) Protocol

    C) Message

    D) Transmission

 

9. ________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.

 

    A) Syntax

    B) Semantics

    C) Timing

    D) None of the above

 

10. Frequency of failure and network recovery time after a failure are measures of the _______of a network.

 

    A) Performance

    B) Security

    C) Reliability

    D) Feasibility

 

11. A television broadcast is an example of _______ transmission.

 

    A) half-duplex

    B) simplex

    C) full-duplex

    D) automatic

 

12. Data flow between two devices can occur in a _______ way.

 

    A) simplex

    B) half-duplex

    C) full-duplex

    D) all of the above

 

13. _______ are special-interest groups that quickly test, evaluate, and standardize new technologies.

 

    A) Standards organizations

    B) Regulatory agencies

    C) Forums

    D) All of the above

 

14. Which agency developed standards for physical connection interfaces and electronic signaling specifications?

 

    A) ISO

    B) ITU-T

    C) ANSI

    D) EIA

 

15. A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.

 

    A) LAN

    B) MAN

    C) WAN

    D) none of the above

 

16. _______ refers to two characteristics: when data should be sent and how fast it can be sent.

 

    A) Semantics

    B) Timing

    C) Syntax

    D) none of the above

 

17. This was the first network.

 

    A) CSNET

    B) NSFNET

    C) ARPANET

    D) ANSNET

 

18. Devices may be arranged in a _____ topology.

 

    A) mesh

    B) ring

    C) bus

    D) all of the above

 

19. _______ is the protocol suite for the current Internet.

 

    A) UNIX

    B) NCP

    C) TCP/IP

    D) ACM

 

20. ________ is a collection of many separate networks.

 

    A) A WAN

    B) An internet

    C) A LAN

    D) None of the above

 

21. In a ________ connection, three or more devices share a link.

 

    A) point-to-point

    B) multipoint

    C) (a) and (b)

    D) none of the above

 

22. Which organization has authority over interstate and international commerce in the communications field?

 

   A) FCC

    B) IEEE

    C) ITU-T

    D) ISOC

 

23. In the original ARPANET, _______ were directly connected together.

 

    A) routers

    B) host computers

    C) networks

    D) IMPs

 

24. Communication between a computer and a keyboard involves ______________ transmission.

 

    A) simplex

    B) half-duplex

    C) full-duplex

    D)  automatic

 

25. Which topology requires a central controller or hub?

 

    A) Mesh

    B) Bus

    C) Star

    D) Ring

 

26. The _______ is the physical path over which a message travels.

 

    A) Protocol

    B) Signal

    C) Medium

    D) All the above

 

27. In a _______ connection, more than two devices can share a single link.

 

    A) multipoint

    B) point-to-point

    C) primary

    D) secondary

 

28. _______ refers to the structure or format of the data, meaning the order in which they are presented.

 

    A) Semantics

    B) Syntax

    C) Timing

    D) All of the above

 

29. An unauthorized user is a network _______ issue.

 

    A) Security

    B) Reliability

    C) Performance

    D) All the above

 

30. ________ is an idea or concept that is a precursor to an Internet standard.

 

    A) RCF

    B) ID

    C) RFC

    D) none of the above

 

31. In _______ transmission, the channel capacity is shared by both communicating devices at all times.

 

    A) simplex

    B) half-duplex

    C) full-duplex

    D) half-simplex

 

 

25. The TCP/IP _______ layer is equivalent to the combined session, presentation, and application layers of the OSI model.

 

    A)   data link

    B)   network

    C)   physical

    D)   application

 

26. When a host on network A sends a message to a host on network B, which address does the router look at?

 

    A)   logical

    B)   physical

    C)   port

    D)   none of the above

 

27. As the data packet moves from the upper to the lower layers, headers are _______.

 

    A)   Rearranged

    B)   Removed

    C)   Added

    D)   Modified

 

28. The physical layer is concerned with the movement of _______ over the physical medium.

 

    A)   dialogs

    B)   protocols

    C)   bits

    D)   programs

 

29. To deliver a message to the correct application program running on a host, the _______ address must be consulted.

 

    A)   physical

    B)   port

    C)   IP

    D)   none of the above

 

30. Ethernet uses a ______ physical address that is imprinted on the network interface card (NIC).

 

    A)   32-bit

    B)   6-byte

    C)   64-bit

    D)   none of the above

 

31. The _______ layer is the layer closest to the transmission medium.

 

    A)   Network

    B)   Transport

    C)   Physical

    D)   Data link

 

32. The OSI model consists of _______ layers.

 

    A)   eight

    B)   seven

    C)   five

    D)   three

 

33. The ________ address, also known as the link address, is the address of a node as defined by its LAN or WAN.

 

    A)   IP

    B)   port

    C)   specific

    D)   physical

 

34. Layer 2 lies between the physical layer and the _______ layer.

 

    A)   Data link

    B)   Transport

    C)   Network

    D)   None of the above

 

35. Why was the OSI model developed?

 

    A)   The rate of data transfer was increasing exponentially

    B)   Standards were needed to allow any two systems to communicate

    C)   Manufacturers disliked the TCP/IP protocol suite.

    D)   None of the above

 

36. In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______.

 

    A)   removed

    B)   added

    C)   rearranged

    D)   modified

 

37. In the OSI model, when data is transmitted from device A to device B, the header from A's layer 5 is read by B's _______ layer.

 

    A)   session

    B)   physical

    C)   transport

    D)   presentation

 

38. The seven-layer _____ model provides guidelines for the development of universally compatible networking protocols.

 

    A)   ISO

    B)   OSI

    C)   IEEE

    D)   none of the above

 

39. The Internet model consists of _______ layers.

 

    A)   Eight

    B)   Seven

    C)   Five

    D)   Three

 

40. In the OSI model, what is the main function of the transport layer?

 

    A)   process-to-process message delivery

    B)   node-to-node delivery

    C)   synchronization

    D)   updating and maintenance of routing tables

 

41. _______ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer.

 

    A)   IP

    B)   TCP

    C)   UDP

    D)   none of the above

 

42. The ______ layer establishes, maintains, and synchronizes the interactions between communicating devices.

 

    A)   session

    B)   physical

    C)   transport

    D)   network

 

43. A port address in TCP/IP is ______ bits long.

 

    A)   16

    B)   32

    C)   48

    D)   none of the above

 

44. In the OSI model, encryption and decryption are functions of the ________ layer.

 

    A)   application

    B)   presentation

    C)   session

    D)   transport

 

45. TCP/IP is a ______ hierarchical protocol suite developed ____ the OSI model.

 

    A)   five-layer; before

    B)   six-layer; before

    C)   seven-layer; before

    D)   five-layer; after

 

46. The ________ address, also known as the link address, is the address of a node as defined by its LAN or WAN.

 

    A)   logical

    B)   port

    C)   physical

    D)   none of the above

 

47. The _______ model shows how the network functions of a computer ought to be organized.

 

    A)   ANSI

    B)   CCITT

    C)   ISO

    D)   OSI

 

48. The _______ layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.

 

    A)   network

    B)   presentation

    C)   transport

    D)   data link

 

 

 

48. The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

 

    A)   DSSS

    B)   FHSS

    C)   FDM

    D)   TDM

 

49. In synchronous TDM, for n signal sources of the same data rate, each frame contains _______ slots.

 

    A)   n + 1

    B)   n - 1

    C)   0 to n

    D)   n

 

50. Which multiplexing technique transmits digital signals?

 

    A)   WDM

    B)   FDM

    C)   TDM

    D)   None of the above

 

51. The sharing of a medium and its link by two or more devices is called _______.

 

    A)   modulation

    B)   multiplexing

    C)   encoding

    D)   line discipline

 

52. _______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.

 

    A)   Multiplexing

    B)   Spread spectrum

    C)   Modulation

    D)   None of the above.

 

53. ______ is an analog multiplexing technique to combine optical signals.

 

    A)   WDM

    B)   FDM

    C)   TDM

    D)   None of the above

 

54. FDM is an _________technique.

 

    A)   digital

    B)   analog

    C)   either (a) or (b)

    D)   none of the above

 

55. ______ can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted.

 

    A)   TDM

    B)   FDM

    C)   Both (a) or (b)

    D)   Neither (a) or (b)

 

56. In TDM, the transmission rate of the multiplexed path is usually _______ the sum of the transmission rates of the signal sources.

 

    A)   equal to

    B)   less than

    C)   greater than

    D)   not related to

 

57. In a multiplexed system, __ lines share the bandwidth of ____ link.

 

    A)   1; n

    B)   n; 1

    C)   1; 1

    D)   n; n

 

58. _________ utilization is the use of available bandwidth to achieve specific goals.

 

    A)   Amplitude

    B)   Frequency

    C)   Bandwidth

    D)   None of the above

 

59. ____ is designed to use the high bandwidth capability of fiber-optic cable.

 

    A)   WDM

    B)   FDM

    C)   TDM

    D)   None of the above

 

60. We can divide ____ into two different schemes: synchronous or statistical.

 

    A)   WDM

    B)   TDM

    C)   FDM

    D)   none of the above

 

61. In ________ TDM, each input connection has an allotment in the output even if it is not sending data.

 

    A)   isochronous

    B)   statistical

    C)   synchronous

    D)   none of the above

 

62. In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.

 

    A)   isochronous

    B)   synchronous

    C)   statistical

    D)   none of the above

 

63. The word ______ refers to the portion of a _______ that carries a transmission.

 

    A)   line; channel

    B)   channel; link

    C)   link; channel

    D)   line; link

 

64. Which multiplexing technique shifts each signal to a different carrier frequency?

 

    A)   FDM

    B)   TDM

    C)   Both (a) and (b)

    D)   None of the above

 

65. Which multiplexing technique transmits analog signals?

 

    A)   WDM

    B)   TDM

    C)   FDM

    D)   (a) and (c)

 

66. ________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.

 

    A)   Demodulating

    B)   Multiplexing

    C)   Compressing

    D)   None of the above

 

67. ________ can be achieved by using multiplexing; ______ can be achieved by using spreading.

 

    A)   Privacy and antijamming; efficiency

    B)   Privacy and efficiency; antijamming

    C)   Efficiency; privacy and antijamming

    D)   Efficiency and antijamming; privacy

 

68. The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits.

 

    A)   DSSS

    B)   FHSS

    C)   FDM

    D)   TDM

 

69. ________ is a digital process that allows several connections to share the high bandwidth of a link.

 

    A)   WDM

    B)   TDM

    C)   FDM

    D)   None of the above

 

70. _______ is a digital multiplexing technique for combining several low-rate channels into one high-rate one.

 

    A)   WDM

    B)   TDM

    C)   FDM

    D)   None of the above

 

71. In ________, we combine signals from different sources to fit into a larger bandwidth.

 

    A)   line coding

    B)   block coding

    C)   spread spectrum

    D)   none of the above

 

72. Which multiplexing technique involves signals composed of light beams?

 

    A)   WDM

    B)   FDM

    C)   TDM

    D)   none of the above

 

 

73. When the angle of incidence is _______ the critical angle, the light beam bends along the interface.

 

    A)   less than

    B)   equal to

    C)   more than

    D)   none of the above

 

74. Transmission media lie below the _______ layer.

 

    A)   application

    B)   transport

    C)   network

    D)   physical

 

75. _________ cable consists of an inner copper core and a second conducting outer sheath.

 

    A)   Twisted-pair

    B)   Shielded twisted-pair

    C)   Coaxial

    D)   Fiber-optic

 

76. __________ consists of a central conductor and a shield.

 

    A)   Twisted-pair

    B)   Coaxial

    C)   Fiber-optic

    D)   none of the above

 

77. _______ cable can carry signals of higher frequency ranges than _______ cable.

 

    A)   Coaxial; twisted-pair

    B)   Twisted-pair; fiber-optic

    C)   Coaxial; fiber-optic

    D)   none of the above

 

78. _________ are used for cellular phone, satellite, and wireless LAN communications.

 

    A)   Radio waves

    B)   Infrared waves

    C)   Microwaves

    D)   none of the above

 

79. The inner core of an optical fiber is _______ in composition.

 

    A)   copper

    B)   glass or plastic

    C)   bimetallic

    D)   liquid

 

80. What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?

 

    A)   insulating material

    B)   inner conductor

    C)   diameter of cable

    D)   outer conductor

 

81. Signals with a frequency below 2 MHz use _______ propagation.

 

    A)   line-of-sight

    B)   sky

    C)   ground

    D)   none of the above

 

82. In an optical fiber, the inner core is _______ the cladding.

 

    A)   less dense than

    B)   denser than

    C)   the same density as

    D)   another name for

 

83. ________ cable consists of two insulated copper wires twisted together.

 

    A)   Twisted-pair

    B)   Coaxial

    C)   Fiber-optic

    D)   none of the above

 

84. In fiber optics, the signal is _______ waves.

 

    A)   radio

    B)   light

    C)   infrared

    D)   very low-frequency

 

85. Signals with a frequency above 30 MHz use _______propagation.

 

    A)   line-of-sight

    B)   sky

    C)   ground

    D)   none of the above

 

86. A parabolic dish antenna is a(n) _______ antenna.

 

    A)   unidirectional

    B)   bidirectional

    C)   omnidirectional

    D)   horn

 

87. A(n) _______ medium provides a physical conduit from one device to another.

 

    A)   unguided

    B)   guided

    C)   either (a) or (b)

    D)   none of the above

 

88. ________ cable is used for voice and data communications.

 

    A)   Twisted-pair

    B)   Coaxial

    C)   Fiber-optic

    D)   none of the above

 

89. Signals with a frequency between 2 MHz and 30 MHz use _______ propagation.

 

    A)   ground

    B)   line-of-sight

    C)   sky

    D)   none of the above

 

90. Transmission media are usually categorized as _______.

 

    A)   determinate or indeterminate

    B)   fixed or unfixed

    C)   guided or unguided

    D)   metallic or nonmetallic

 

91. ________ are used for short-range communications such as those between a PC and a peripheral device.

 

    A)   Radio waves

    B)   Infrared waves

    C)   Microwaves

    D)   none of the above

 

92. _________ media transport electromagnetic waves without the use of a physical conductor.

 

    A)   Guided

    B)   Unguided

    C)   Either (a) or (b)

    D)   None of the above

 

93. ________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.

 

    A)   Twisted-pair

    B)   Coaxial

    C)   Fiber-optic

    D)   none of the above

 

94. Which of the following primarily uses guided media?

 

    A)   radio broadcasting

    B)   satellite communications

    C)   local telephone system

    D)   cellular telephone system

 

95. When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.

 

    A)   refraction

    B)   reflection

    C)   criticism

    D)   incidence

 

96. Which of the following is not a guided medium?

 

    A)   fiber-optic cable

    B)   coaxial cable

    C)   twisted-pair cable

    D)   atmosphere

 

97. Microwaves are _________.

 

    A)   omnidirectional

    B)   bidirectional

    C)   unidirectional

    D)   none of the above

 

98. ________ cables carry data signals in the form of light.

 

    A)   Twisted-pair

    B)   Coaxial

    c)   none of the above

 

99. Radio waves are _________.

 

    A)   unidirectional

    B)   omnidirectional

    C)   bidirectional

    D)   none of the above

 

100. In a fiber-optic cable, the signal is propagated along the inner core by _______.

 

    A)   refraction

    B)   reflection

    C)   modulation

    D)   none of the above

 

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