MCQOPTIONS
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MCQOPTIONS
This section includes 203 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Networks knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The physical layer translates logical communication requests from the ______ into hardware specific operations. |
| A. | data link layer |
| B. | network layer |
| C. | trasnport layer |
| D. | application layer |
| Answer» B. network layer | |
| 2. |
The physical layer is responsible for __________ |
| A. | line coding |
| B. | channel coding |
| C. | modulation |
| D. | all of the mentioned |
| Answer» E. | |
| 3. |
In asynchronous serial communication the physical layer provides ___________ |
| A. | start and stop signalling |
| B. | flow control |
| C. | both start & stop signalling and flow control |
| D. | only start signalling |
| Answer» D. only start signalling | |
| 4. |
The physical layer provides __________ |
| A. | mechanical specifications of electrical connectors and cables |
| B. | electrical specification of transmission line signal level |
| C. | specification for IR over optical fiber |
| D. | all of the mentioned |
| Answer» E. | |
| 5. |
The portion of physical layer that interfaces with the media access control sublayer is called ___________ |
| A. | physical signalling sublayer |
| B. | physical data sublayer |
| C. | physical address sublayer |
| D. | physical transport sublayer |
| Answer» B. physical data sublayer | |
| 6. |
The black and white TV is an example of |
| A. | non periodic composite signal |
| B. | periodic composite signal |
| C. | periodic simple signal |
| D. | None of the above |
| Answer» B. periodic composite signal | |
| 7. |
SNR (signal to noise ratio) is equals to |
| A. | Avg signal power/Avg noise power |
| B. | Avg signal power/Avg distortion |
| C. | Avg noise power/Attenuation |
| D. | Avg Attenuation/Avg distortion |
| Answer» B. Avg signal power/Avg distortion | |
| 8. |
A transmission media can have signal impairment because of |
| A. | Noise |
| B. | Attenuation |
| C. | distortion |
| D. | All of the above |
| Answer» E. | |
| 9. |
The constellation diagram of 16-QAM has ______ dots. |
| A. | 4 |
| B. | 16 |
| C. | 8 |
| D. | none of the above |
| Answer» C. 8 | |
| 10. |
The Federal Communications Commission (FCC) allows ______ kHz for each FM station. |
| A. | 20 |
| B. | 100 |
| C. | 200 |
| D. | none of the above |
| Answer» C. 200 | |
| 11. |
In real life, we cannot have a |
| A. | Noisy Channel |
| B. | Noiseless channel |
| C. | Bandwidth of channel |
| D. | Frequency of channel |
| Answer» C. Bandwidth of channel | |
| 12. |
In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant. |
| A. | ASK |
| B. | PSK |
| C. | FSK |
| D. | QAM |
| Answer» B. PSK | |
| 13. |
The term that describes the position of the waveform relative to time 0 is |
| A. | Wavelength |
| B. | Period |
| C. | Frequency |
| D. | Phase |
| Answer» E. | |
| 14. |
Propagation time is equals to |
| A. | Distance/Propagation speed |
| B. | Propagation speed/Bandwidth |
| C. | Message size/ Bandwidth |
| D. | Bandwidth/Queuing time |
| Answer» B. Propagation speed/Bandwidth | |
| 15. |
One Picoseconds (PS) is equivalent to |
| A. | 10-3 s |
| B. | 10-6 s |
| C. | 10-9 s |
| D. | 10-12 s |
| Answer» E. | |
| 16. |
The range of frequencies contained in a composite signal is its |
| A. | Wavelength |
| B. | Bandwidth |
| C. | amplitude |
| D. | Composite |
| Answer» C. amplitude | |
| 17. |
_______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data. |
| A. | Digital-to-analog |
| B. | Analog-to-analog |
| C. | Analog-to-digital |
| D. | Digital-to-digital |
| Answer» B. Analog-to-analog | |
| 18. |
We send a voice signal from a microphone to a recorder, the transmission is |
| A. | Base band transmission |
| B. | Broad band transmission |
| C. | both a and b |
| D. | None of Above |
| Answer» B. Broad band transmission | |
| 19. |
Period is the inverse of |
| A. | Frequency |
| B. | Phase |
| C. | Amplitude |
| D. | Signals |
| Answer» B. Phase | |
| 20. |
Sine wave can be represented by three parameters |
| A. | peak amplitude, frequency and bandwidth |
| B. | Frequency, phase and bandwidth |
| C. | Peak amplitude, frequency and Phase |
| D. | Peak amplitude, bandwidth, Period |
| Answer» D. Peak amplitude, bandwidth, Period | |
| 21. |
The completion of one full pattern is called a |
| A. | period |
| B. | Cycle |
| C. | Frame |
| D. | Segment |
| Answer» C. Frame | |
| 22. |
SNR stands for |
| A. | Shannon Noise ratio |
| B. | Shannon Noise Relation |
| C. | Signal Noise ratio |
| D. | Signal Noise Relation |
| Answer» D. Signal Noise Relation | |
| 23. |
How many carrier frequencies are used in BPSK? |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | none of the above |
| Answer» C. 0 | |
| 24. |
How many carrier frequencies are used in BFSK? |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | none of the above |
| Answer» B. 1 | |
| 25. |
Repeater function in the ...................... layer. |
| A. | Physical |
| B. | Data link |
| C. | Network |
| D. | None of these |
| Answer» B. Data link | |
| 26. |
Given the frequency 24Hz the corresponding period would be |
| A. | 87.9ms |
| B. | 41.7ms |
| C. | 90ms |
| D. | 12ms |
| Answer» C. 90ms | |
| 27. |
The relationship between amplitude and frequency can be represented by |
| A. | frequency-domain plot. |
| B. | Time-domain plot. |
| C. | Phase Domain Plot |
| D. | Amplitude domain Plot |
| Answer» B. Time-domain plot. | |
| 28. |
If the baud rate for a 64-QAM signal is 2000, what is the bit rate? |
| A. | 300 |
| B. | 400 |
| C. | 1000 |
| D. | 12000 |
| Answer» E. | |
| 29. |
In data communications, we use periodic analog signals and |
| A. | Periodic digital signals |
| B. | Non periodic analog signals |
| C. | Non periodic digital signals |
| D. | both a and c |
| Answer» D. both a and c | |
| 30. |
Digital signals are represented in |
| A. | Sine Waves |
| B. | Levels |
| C. | Stages |
| D. | None of the above |
| Answer» C. Stages | |
| 31. |
If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth? |
| A. | 2500 Hz |
| B. | 900 Hz |
| C. | 800 Hz |
| D. | can’t be determined with the information given |
| Answer» D. can’t be determined with the information given | |
| 32. |
The difference in the delay of the signal may create a difference in |
| A. | Phase |
| B. | Frequency |
| C. | Period |
| D. | Decibel |
| Answer» B. Frequency | |
| 33. |
Analog data refers to information that is |
| A. | Discrete state |
| B. | Continuous state |
| C. | Randomly arranged |
| D. | None of Above |
| Answer» C. Randomly arranged | |
| 34. |
The constellation diagram of BASK has ______ dots. |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | none of the above |
| Answer» B. 1 | |
| 35. |
The time required for a bit to travel from source to destination is |
| A. | Latency |
| B. | Propagation Time |
| C. | Delay |
| D. | Transmission time |
| Answer» C. Delay | |
| 36. |
This kind of data transmission allows data to be transmitted in both directions on a signal carrier at the same time. |
| A. | full-duplex |
| B. | duplex |
| C. | half-duplex |
| D. | All of the above |
| Answer» B. duplex | |
| 37. |
The power in our house can be represented by |
| A. | sine wave with a peak amplitude |
| B. | sine wave with amplitude |
| C. | sine wave with phase |
| D. | sine wave with frequency |
| Answer» B. sine wave with amplitude | |
| 38. |
What is the difference between a switch and a hub? |
| A. | Switches operate at physical layer while hubs operate at data link layer |
| B. | Switches operate at data link layer while hubs operate at transport layer |
| C. | Switches operate at data link layer while hubs operate at physical layer |
| D. | Switches operate at transport layer while hubs operate at physical layer |
| Answer» D. Switches operate at transport layer while hubs operate at physical layer | |
| 39. |
Increasing the levels of a signal may reduce the |
| A. | Reliability of the system |
| B. | Efficiency of the system |
| C. | speed of system |
| D. | Frequency of system |
| Answer» B. Efficiency of the system | |
| 40. |
The constellation diagram of QPSK has ______ dots. |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | none of the above |
| Answer» D. none of the above | |
| 41. |
Data to be transmitted must be transformed into |
| A. | Electronic signal |
| B. | Magnetic pulses |
| C. | Radiations |
| D. | Electromagnetic signals |
| Answer» E. | |
| 42. |
We cannot send the digital signal directly to the channel, when the channel is |
| A. | bandpass |
| B. | Bypass |
| C. | baseband |
| D. | Low pass |
| Answer» B. Bypass | |
| 43. |
A digital signal is a composite analog signal with |
| A. | finite bandwidth |
| B. | Infinite bandwidth |
| C. | zero bandwidth |
| D. | None of the above |
| Answer» C. zero bandwidth | |
| 44. |
In data communications, the non periodic signals |
| A. | Sine wave |
| B. | Digital Signals |
| C. | Analog Signals |
| D. | None of the above |
| Answer» E. | |
| 45. |
In baseband transmission, the required bit rate is proportional to the |
| A. | Wavelength |
| B. | frequency |
| C. | Period |
| D. | Bandwidth |
| Answer» E. | |
| 46. |
Repeater operates in which layer of the OSI model |
| A. | Physical Layer |
| B. | Network Layer |
| C. | Data link Layer |
| D. | Transport Layer |
| Answer» B. Network Layer | |
| 47. |
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? |
| A. | 700 KHz |
| B. | 705 KHz |
| C. | 710 KHz |
| D. | Cannot be determined from given information |
| Answer» B. 705 KHz | |
| 48. |
A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature). |
| A. | amplitude and phase |
| B. | amplitude and frequency |
| C. | frequency and phase |
| D. | none of the above |
| Answer» B. amplitude and frequency | |
| 49. |
Bit rate is measured in |
| A. | Bits per Hertz |
| B. | Bits Per Second |
| C. | Nano seconds |
| D. | Pixels per second |
| Answer» C. Nano seconds | |
| 50. |
The propagation speed of electromagnetic signals depends on the |
| A. | medium |
| B. | Period |
| C. | Phase |
| D. | delay |
| Answer» B. Period | |