Computer Hardware and Networking MCQ Quiz Hub

NETWORKING /PHYSICAL LAYER SET 1

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




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




3. Before data can be transmitted, they must be transformed to ________.




4. A periodic signal completes one cycle in 0.001 s. What is the frequency?




5. The physical layer concerns with




6. The term ......... describes the position of the waveform relative to time 0.




7. In a frequency-domain plot, the horizontal axis measures the ________.




8. In a time-domain plot, the horizontal axis is a measure of ________.




9. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?




10. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?




11. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?




12. As frequency increases, the period ________.




13. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.




14. A sine wave is ________.




15. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.




16. A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.




17. _______ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.




18. __ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.




19. __ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.




20. When propagation speed is multiplied by propagation time, we get the ________.




21. Data can be ________. d. none of the above




22. _______ data are continuous and take continuous values.




23. _______ data have discrete states and take discrete values.




24. Signals can be ________.




25. _____ signals can have an infinite number of values in a range.




26. _______ signals can have only a limited number of values.




27. Frequency and period are ______.




28. _______is the rate of change with respect to time.




29. ___ describes the position of the waveform relative to time 0.




30. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.




31. A _________ sine wave is not useful in data communications; we need to send a _______ signal




32. The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.




33. A(n)_________ signal is a composite analog signal with an infinite bandwidth.




34. Baseband transmission of a digital signal is possible only if we have a ____ channel.




35. If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.




36. For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.




37. For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.




38. ______ can impair a signal.




39. The _________ product defines the number of bits that can fill the link.




40. The portion of physical layer that interfaces with the media access control sublayer is called




41. physical layer provides




42. In asynchronous serial communication the physical layer provides




43. The physical layer is responsible for




44. Baud means?




45. Which of the following devices takes data sent from one network device and forwards it to all devices on the network regardless of the intended recipient?




46. Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?




47. which of the following devices is used to connect different network segments and manage the traffic between them?




48. Unipolar, bipolar, and polar encoding are types of _______ encoding.




49. _______ encoding has a transition at the middle of each bit.




50. Unipolar, bipolar, and polar encoding are types of _______ encoding. a. line b. block c. NRZ d. Unipolar, bipolar, and polar encoding are types of _______ encoding.