Welcome to Washburn University, Topeka, KS
Name: __________________________ Date: _____________
|1. |Data is physically transmitted from one computer or terminal to another in the ________ layer. |
|A) |physical |
|B) |transport |
|C) |application |
|D) |terminal |
|E) |data link |
|2. |____________ refers to the transmission characteristics of the circuit. |
|A) |handshaking |
|B) |virtual circuit |
|C) |bonding |
|D) |logical circuit |
|E) |physical circuit |
|3. |Two fundamentally different types of data are: |
|A) |DSL and ADSL |
|B) |asymmetric and symmetric |
|C) |Microsoft and IBM |
|D) |digital and analog |
|E) |local area and wide area |
|4. |In general, networks designed to transmit primarily computer data are likely to be ________, while networks designed to transmit|
| |voice data are likely to be ________. |
|A) |slow, fast |
|B) |level 1, level 2 |
|C) |numeric, musical |
|D) |direct, indirect |
|E) |digital, analog |
|5. |Which of the following is not a key advantage of digital transmission? |
|A) |It permits only low transmission rates. |
|B) |It is more efficient. |
|C) |It is simpler to integrate voice, video, and data on the same circuit. |
|D) |It is more secure. |
|E) |It produces fewer errors. |
|6. |_________ is the basic layout of the circuit. |
|A) |point-to-point configuration |
|B) |configuration |
|C) |circuit configuration |
|D) |circuit design |
|E) |circuit plan |
|7. |A(n) __________ circuit is another name for a multipoint configuration. |
|A) |analog |
|B) |dedicated |
|C) |point-to-point |
|D) |shared |
|E) |simplex |
|8. |Which is not true about point-to-point circuits? |
|A) |point-to-point circuits are dedicated to the use of the two computers. |
|B) |point-to-point circuits are more expensive than multipoint circuits. |
|C) |point-to-point circuits are called dedicated circuits. |
|D) |point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits.|
|E) |Point-to-point circuits are used when the computers generate enough traffic to fill the capacity of the communication |
| |circuit. |
|9. |Having a conversation with someone using a cellular phone is an example of _________ transmission. |
|A) |simplex |
|B) |full-duplex |
|C) |half-duplex |
|D) |analog |
|E) |digital |
|10. |The ability to transmit in both directions, but only in one direction at a time is an example of _______________ transmission. |
|A) |simplex |
|B) |full-duplex |
|C) |half-duplex |
|D) |analog |
|E) |digital |
|11. |The two basic types of media are: |
|A) |statistical and frequency |
|B) |guided and wireless (radiated) |
|C) |local and wide area |
|D) |attenuator and Gaussian |
|E) |duplexed and non-duplexed |
|12. |Which of the following would be considered a type of wireless media? |
|A) |unshielded twisted pair |
|B) |shielded twisted pair |
|C) |coaxial cable |
|D) |microwave |
|E) |fiber optics |
|13. |The type of media usually installed on homes and businesses by the telephone company is called ____________. |
|A) |fiber optic cable |
|B) |coaxial cable |
|C) |twisted pair |
|D) |phone cable |
|E) |phone wire |
|14. |The earliest type of fiber optic systems were: |
|A) |Graded index multimode |
|B) |Attenuated |
|C) |Multimode |
|D) |Single mode |
|E) |Step mode |
|15. |Another term for the weakening of a signal over distance is: |
|A) |turnaround time |
|B) |propagation delay |
|C) |dispersion |
|D) |insulation |
|E) |attenuation |
|16. |___________ refers to the spreading of the signal that different parts of the signal arrive at different times at the |
| |destination. |
|A) |turnaround time |
|B) |propagation delay |
|C) |dispersion |
|D) |insulation |
|E) |attenuation |
|17. |Which of the following media can best withstand harsh environmental conditions? |
|A) |shielded twisted pair |
|B) |unshielded twisted pair |
|C) |Cat 5 twisted pair |
|D) |coaxial cable |
|E) |fiber optic cable |
|18. |__________ is a line-of-sight type of wireless media. |
|A) |coaxial cable |
|B) |microwave |
|C) |radio |
|D) |twisted pair |
|E) |fiber optic |
|19. |____________ transmission is prone to interference from smoke, heavy rain and fog and requires line-of-sight. |
|A) |microwave |
|B) |radio |
|C) |infrared |
|D) |fiber optic |
|E) |led |
|20. |Microwave transmission: |
|A) |is a type of high frequency radio communication |
|B) |requires a clear line-of-sight path |
|C) |is typically used for long distance data transmission |
|D) |does not require the laying of any cable |
|E) |all of the above |
|21. |______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite |
| |transmission). |
|A) |Line-of-sight effect |
|B) |Multimode index |
|C) |Saturation effect |
|D) |Raindrop attenuation |
|E) |Propagation delay |
|22. |Which of the following is not an important factor to consider when selecting media to be used in a network? |
|A) |prestige value of the type of media |
|B) |type of network |
|C) |cost |
|D) |transmission distance |
|E) |security |
|23. |Which of the following media is the least secure? |
|A) |coaxial cable |
|B) |unshielded twisted pair |
|C) |shielded twisted pair |
|D) |fiber optic cable |
|E) |infrared |
|24. |Which of the following media has the lowest error rates and the highest transmission speeds? |
|A) |coaxial cable |
|B) |unshielded twisted pair |
|C) |shielded twisted pair |
|D) |fiber optic cable |
|E) |infrared |
|25. |Transmission speeds: |
|A) |are the same among all media |
|B) |are not a factor in selecting a media because all media have more than enough speed to serve current communication demands|
|C) |are a constant, 56Kbps, for all media types |
|D) |differ widely among media |
|E) |always have a direct correlation with security |
|26. |A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters. |
|A) |256 |
|B) |20 |
|C) |200 |
|D) |512 |
|E) |1024 |
|27. |____________ is one of the most commonly used coding schemes used in data transmission. |
|A) |ASCII |
|B) |ISDN |
|C) |MAU |
|D) |ATM |
|E) |FDM |
|28. |The representation of the character A by the group of 8 bits, 10000001, is an example of: |
|A) |digital coding |
|B) |phase modulation |
|C) |binary modulation |
|D) |analog transmission |
|E) |pitch variation |
|29. |When all bits of a character are transferred one after another, the bits are transferred in ___________ mode. |
|A) |serial |
|B) |frequency division |
|C) |multiplexing |
|D) |parallel |
|E) |full complex |
|30. |Which of the following statements is correct? |
|A) |Parallel transmission is most often used for sending data on a circuit that is made up of one wire. |
|B) |Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single |
| |bit, then a second bit, and so on, until all the bits are transmitted. |
|C) |Parallel transmission is only used for analog data. |
|D) |Serial transmission is slower than parallel transmission. |
|E) |Parallel transmission is the same as serial transmission. |
|31. |___________ is not a type of digital signaling technique. |
|A) |Non-return-to-zero signaling |
|B) |Unipolar signaling |
|C) |Manchester encoding |
|D) |Return-to-zero signaling |
|E) |Data rate signaling |
|32. |With which type of digital signaling does the signal always return to zero volts after each bit? |
|A) |Non-return-to-zero signaling |
|B) |Unipolar signaling |
|C) |Return-to-zero signaling |
|D) |Data rate signaling |
|E) |Huffman encoding signal |
|33. |Which type of digital signaling would experience fewer errors because it has more distinct signals? |
|A) |unipolar |
|B) |serial |
|C) |bipolar |
|D) |attenuation |
|E) |Huffman encoding signal |
|34. |Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals? |
|A) |phase |
|B) |attenuation |
|C) |bipolar |
|D) |bandwidth |
|E) |codec |
|35. |The direction in which the sound wave begins is known as: |
|A) |amplitude, which our ears detect as loudness |
|B) |frequency, which our ears detect as pitch |
|C) |phase |
|D) |bandwidth |
|E) |furlong |
|36. |The height of a sound wave is called its: |
|A) |frequency |
|B) |phase |
|C) |amplitude |
|D) |bandwidth |
|E) |furlong |
|37. |_____________ is not a form of modulation used to transform digital data into analog signals. |
|A) |synchronous time division |
|B) |amplitude shift keying |
|C) |amplitude modulation |
|D) |frequency modulation |
|E) |phase modulation |
|38. |____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0. |
|A) |digitizing. |
|B) |sampling |
|C) |modulation |
|D) |demodulation |
|E) |shaping |
|39. |With respect to converting digital data into analog signals, AM stands for: |
|A) |Asynchronous Manchester |
|B) |Analog Multimode |
|C) |Amplitude Modulation |
|D) |Anomaly Multiplexing |
|E) |Analytical Mosaic |
|40. |In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? |
|A) |bandwidth modulation |
|B) |amplitude modulation |
|C) |frequency modulation |
|D) |phase modulation |
|E) |codec modulation |
|41. |When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would|
| |be _______. |
|A) |24 |
|B) |16 |
|C) |2 |
|D) |8 |
|E) |4 |
|42. |____________ is a modulation technique that combines two different amplitude combinations with eight different phase |
| |combinations modulation to send four bits per wave, or symbol. |
|A) |quadrature amplitude modulation |
|B) |time division multiplexing |
|C) |synchronous digital line control |
|D) |pulse code modulation |
|E) |baseband signaling |
|43. |__________ is a unit of signaling speed that indicates how often the signal changes on a communication circuit. |
|A) |bits per second rate |
|B) |phase rate |
|C) |symbol rate |
|D) |attenuation rate |
|E) |trellis rate |
|44. |The _____________ of a circuit determines a circuit's capacity. |
|A) |frequency |
|B) |bandwidth |
|C) |phase |
|D) |amplitude |
|E) |loudness |
|45. |The typical range of human hearing is: |
|A) |0 to 4,000 Hz |
|B) |0 to 1,200 Hz |
|C) |20 to 14,000 Hz |
|D) |0 to 300 Hz |
|E) |0 to 56,000 Hz |
|46. |If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is :|
|A) |890 Hz |
|B) |8900 HZ |
|C) |9100 Hz |
|D) |9Khz |
|E) |890 KHz |
|47. |To get more “bandwidth” in a digital transmission, you must: |
|A) |increase the range of frequencies available for a transmission |
|B) |increase the loudness per transmission |
|C) |decrease the bits per second transmission speed |
|D) |increase the phase shifts per transmission |
|E) |increase the baud rate per transmission |
|48. |Which of the following statements is true? |
|A) |the longer the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire |
|B) |the shorter the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire |
|C) |bandwidth is constant across any wire, therefore distance is not relevant to its capacity |
|D) |the longer the distance of a telephone wire between sender and recipient, the higher the bandwidth across that wire |
|E) |bandwidth is not a term that can be used when discussing telephone transmissions |
|49. |Using TCM that sends 6 bits per each signal and a voice grade line with a bandwidth of 3000 Hz (assume: no noise on the line), |
| |the data capacity would be ___________ bits per second. |
|A) |56K |
|B) |6 |
|C) |24,000 |
|D) |500 |
|E) |18,000 |
|50. |The acronym, Modem, stands for _________________. |
|A) |multiplexing/demultiplexing |
|B) |more/demote |
|C) |Mode-M technique |
|D) |modulator/demodulator |
|E) |Mod emulation technique |
|51. |Which statement is false about modems? |
|A) |modems are usually used in pairs (2 at a time) |
|B) |a receiving modem demodulates and a sending modem modulates |
|C) |most modems support several modem standards so that they can communicate with a variety of modems |
|D) |modems may operate at a lower speed that that for which they are rated, especially if they detect noise in the |
| |communication line |
|E) |modems must always be internal to the computer |
|52. |______ is a modem standard that uses Lempel-Ziv encoding to compress data. |
|A) |V.22 |
|B) |V.44 |
|C) |V.32bis |
|D) |V.34 |
|E) |RS 232 |
|53. |Equipment used to transform analog voice signals to digital signals and digital signals to analog signals. |
|A) |voice converter |
|B) |modem |
|C) |codec |
|D) |multiplexer |
|E) |demodulator |
|54. |_____________ refers to the difference between the original analog data and the approximation of that data using the techniques |
| |for translating from analog data to digital signals. |
|A) |quantizing error |
|B) |handshaking phase |
|C) |modulating frequency |
|D) |POTS anomaly |
|E) |amplitude Trellis effect |
|55. |When converting analog voice data to digital signals, Pulse Code Modulation samples the incoming voice signal _______ times per |
| |second. |
|A) |8,000 |
|B) |8 |
|C) |18,000 |
|D) |64 |
|E) |256 |
|56. |How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels? |
|A) |64 |
|B) |32 |
|C) |16 |
|D) |8 |
|E) |6 |
|57. |If each sample uses 16 bits and the number of samples taken each second is 8000; then the transmission speed on the circuit is? |
|A) |128 Kbps |
|B) |64 Kbps |
|C) |12800 bps |
|D) |96 Kbps |
|E) |32000 bps |
|58. |A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving|
| |communication line costs. |
|A) |transponder |
|B) |multiplexer |
|C) |inverse multiplexer |
|D) |codec |
|E) |intelligent terminal |
|59. |____________ is used by IM and other applications that provide voice services over lower-speed digital circuits. |
|A) |pulse code modulation |
|B) |adaptive differential pulse code modulation |
|C) |Voice conversation |
|D) |code modulation |
|E) |phase modulation |
|60. |The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted |
| |simultaneously across many channels is a: |
|A) |wave division multiplexer |
|B) |time division multiplexer |
|C) |statistical time division multiplexer |
|D) |frequency division multiplexer |
|E) |statistical frequency division multiplexer |
|61. |Frequency division multiplexing: |
|A) |operates by statistically time slicing the signal |
|B) |operates by dividing the signal into different frequencies |
|C) |uses a codec that divides signals into different channels |
|D) |operates by time slicing the signal |
|E) |operates by light dividing the signal |
|62. |________________ separate channels to reduce interference between channels in frequency division multiplexing. |
|A) |Channel blockers |
|B) |Statistical dividers |
|C) |Attenuators |
|D) |Guardbands |
|E) |Adaptive differential processors |
|63. |Time (non-statistical) division multiplexing differs from frequency division multiplexing because it: |
|A) |does not share a communication circuit |
|B) |splits the communication circuit vertically (with time slots) instead of horizontally |
|C) |increases the wavelength and phase angles of the baseband frequency used for transmission |
|D) |moves the baseband of a circuit by shifting it to a higher frequency |
|E) |reduces baseband signal velocity more than frequency division multiplexing |
|64. |Inverse multiplexing means: |
|A) |combining several low speed circuits to enable them to be transmitted across one high speed circuit |
|B) |multiplexing from the terminal to the host, rather than from the host to the terminal |
|C) |combining high speed circuits to enable them to be transmitted across one low speed circuit |
|D) |inverting the frequencies used for transmission across a low speed circuit for switching to a digital circuit |
|E) |multiplexing to a codec, rather than to a modem |
|65. |Digital Subscriber Line: |
|A) |is a fairly recent approach to provide higher data transmission rates across traditional voice circuits in the local loop |
|B) |combines analog transmission and frequency division multiplexing |
|C) |involves the use of a customer premises equipment (CPE) |
|D) |uses a combination of amplitude and phase modulation |
|E) |all of the above |
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