Computer Hardware and Networking MCQ Quiz Hub

NETWORKING /PHYSICAL LAYER SET 3

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1. If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?




2. If the baud rate for a 64-QAM signal is 2000, what is the bit rate?




3. Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?




4. ______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.




5. Which of the following is not a digital-to-analog conversion?




6. In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.




7. In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.




8. A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature).




9. Quadrature amplitude modulation (QAM) is a combination of ___________.




10. ________ uses two carriers, one in-phase and the other quadrature.




11. _____ conversion is the representation of analog information by an analog signal.




12. Analog-to-analog conversion is needed if the available bandwidth is _______.




13. Which of the following is not an analog-to-analog conversion?




14. In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.




15. In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.




16. In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.




17. In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequenc




18. How many carrier frequencies are used in BASK?




19. How many carrier frequencies are used in BFSK?




20. How many carrier frequencies are used in QPSK?




21. The constellation diagram of BASK has ______ dots.




22. The constellation diagram of BPSK has ______ dots.




23. The constellation diagram of QPSK has ______ dots.




24. The constellation diagram of 16-QAM has ______ dots.




25. The Federal Communications Commission (FCC) allows ______kHz for each AM station.




26. The Federal Communications Commission (FCC) allows ______ kHz for each FM station.




27. Which of the following layer decide the transmission rate in a Network?




28. What is the main function of DSLAM?




29. What is the use of Bridge in Network?




30. Which of the following is not the possible ways of data exchange?




31. This kind of data transmission allows data to be transmitted in both directions on a signal carrier at the same time.




32. This kind of data transmission allows data to be transmitted in both directions on a signal carrier at the same time.




33. What is the difference between a switch and a hub?




34. MAC address is also known as __________.




35. Repeater operates in which layer of the OSI model




36. Repeater function in the ...................... layer.




37. A repeater takes a weakened or corrupted signal and ............... it.




38. What device separates a single network into two segments but lets the two segments appear as one to higher protocols?




39. Which of the following is used for modulation and demodulation?




40. Which of the following device is used to connect two systems, especially if the systems use different protocols?




41. The cheapest modems can transmit




42. The cheapest modems can transmit




43. Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?




44. Demodulation is a process of




45. Demodulation is the process of




46. A devices that links two homogeneous packet-broadcast local networks, is




47. The physical layer, in reference to the OSI model, defines




48. Which of the following device copies electrical signals from one Ethernet to another?




49. For connecting modem, a computer must be equipped with a port that conforms to the RS-232 standard of the Electronic Industries Association of America. What do the letters 'RS' stand for?




50. If communication software can be called the "traffic cop" of a micro communication system, then what should the modem be called?




51. If communication software can be called the "traffic cop" of a micro communication system, then what should the modem be called?




52. The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are




53. Interconnected networks need communication processors such as switches, routers, hubs, and gateways. Select the best fit for answer:




54. What is the name of the device that converts computer output into a form that can be transmitted over a telephone line?




55. Now-a-days computers all over the world can talk to each other. Which is one of the special accessories essential for this purpose?




56. Devices on one network can communicate with devices on another network via a




57. What is the name of the device that connects two computers by means of a telephone line?




58. The _____ layer is the layer closest to the transmission medium.




59. Which of the following allows devices on one network to communicate with devices on another network?




60. RS-449/442-A/423-A is




61. A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as




62. A modulator converts a _____ signal to a(n) _____ signal.




63. Repeaters are often used on an 802.3 network to help strengthen the signals being transmitted. As with the length of segments and the number of segments, a limit exists as to how many repeaters can be used between any two nodes. What is the maximum number of repeaters that can be used?




64. A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?




65. Which of the following statements is correct?




66. A modem is connected in between a telephone line and a




67. A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?




68. In a synchronous modem, the digital-to-analog converter transmits signal to the




69. Which of the following connectivity devices is used to extend a network on a purely mechanical basis?




70. Who invented the modem?




71. Propagation time is equals to




72. Period is the inverse of




73. The black and white TV is an example of




74. The level of the signal is inversely proportional to the




75. The Nyquist formula gives us any signal level while Shannon capacity gives us the