Computer Networks Sample Questions and Answers

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Sample Questions and Answers on Computer Networking

1. In OSI Network architecture, the dialogue control and token management are responsibilities of
(a) Session layer
(b) Transport layer
(c) Network layer.
(d) Data link

2. In OSI Network architecture, the routing is performed by
(a) Network layer
(b) Datalink layer
(c) Session layer
(d) Transport layer

3. TCP is
(a) connection oriented
(b) datagram service
(c) None of the above
(d) both (a) and (b) above

4. The process of converting analogue signals into digital signals so they can be processed by a receiving computer is referred to as
(a) Modulation
(b) Synchronizing
(c) Demodulation
(d) Digitising

5. How many OSI Layers are covered in the X.25 Standard?
(a) Two
(b) Three
(c) Seven
(d) Six

6. Layer one of the OSI model is
(a) Physical layer
(b) Transport layer
(c) Link layer
(d) Network layer

7. The X.25 Standard Specifies a
(a) Technique for start-stop data
(b) Technique for dial access
(c) DTEIDCE interface
(d) Data bit rate

8. Which of the following communication modes support two-way traffic but in only one direction at a time?
(a) Simplex
(b) Three quarter duplex
(c) Half-duplex
(d) Full of the above

9. Which of the following might be used by a company to satisfy its growing communications needs?
(a) Front-end processor
(b) Controller
(c) Multiplexer
(d) Concentrator

10. What is the number of separate protocol layers at the serial interface gateway specified by X.25 standard?
(a) 4
(b) 6
(c) 2
(d) 3

11. The interactive transmission of data within a time-sharing system may be best suited to
(a) Simplex Lines
(b) Full duplex lines.
(c) Half duplex lines
(d) Biflex line

12. Which of the following statement is incorrect?
(a) The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission.
(b) Half-duplex line is a communication line in which data can move in two directions, but not at the same time.
(c) Tele processing combines tele communication and DP techniques in online activities
(d) Batch processing is the preferred processing mode for telecommunication operation.

13. Which of the following is considered a broad band communication channel?
(a) Coaxial code
(b) Microwave circuits
(c) Fiber optic cable
(d) Satellite systems
(e) All the above

14. Which of the following is not a transmission medium ?
(a) Telephone lines
(b) Modem
(c) Coaxial cable
(d) Microwave system

15. Which of the following does not allow multiple uses or devices to share one communications line?
(a) Doubleplexer
(b) Concentrator
(c) Multiplexer
(d) Controller

16. Which of the following signals is not standard Rs-232-c signals
(a) VDR
(b) CTs
(c) RTs
(d) DsR

17. Which of the following statement is incorrect?
(a) Multiplex are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line
(b) HDLC is a standard synchronous communications protocol.
(c) RTC/CTs is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data.
(d) RTS/CTS is the way the terminal indicates ringing.

18. Which of the following is an advantage of using fiber optics data transmission?
(a) Resistance to date theft
(b) Low noise level
(c) Fast date transmission rate
(d) Few transmission errors
(e) All of the above

19. Which of the following is required to communicate between two computers ?
(a) Communication software
(b) Protocol
(c) Access to transmission medium
(d) Communications hard ware
(e) All of the above

20. The transmission signal coding method of TI carrier is called
(a) Bipolar
(b) NRZ
(c) Manchester
(d) Binary

21. Which date communication method is used to transmit the date over a serial communication link ?
(a) Simplex
(b) Full duplex
(c) Half-duplex
(d) both (b) and (c) above

22. What is the minimum number of wires needed to send date over a serial communication link layer ?
(a) 1
(b) 4
(c) 2
(d) 6

23. Which of the following types of channels moves date relatively slowly?
(a) Wide band channel
(b) Narrow band channel.
(c) Voice band channel
(d) Broadband channel

24. Most date communications involving telegraph lines use:
(a) Simplex lines
(b) Narrowband channels
(c) Wideband channels
(d) Dialed service.

25. A communications device that combines transmissions from several I/O devices into one line is a
(a) Concentrator
(b) Multiplexer
(c) Modifier
(d) Full-duplex line

26. How much power (roughly) a light emitting diode can couple into an optical fiber?
(a) 100 microwatts
(b) 100 picowatts
(c) 440 microwatts
(d) 10 milliwatts

27. The synchronous modems are more costly than the asynchronous modems because they
(a) produce large volume of date
(b) contain clock recovery circuits
(c) transmit the date with stop and start bits.
(d) operate with larger band-width

28. Which of the following statement is correct ?
(a) Terminal section of a synchronous modem contains the scrambler.
(b) Receiver section of a synchronous modem contains the scrambler
(c) Transmission section of a synchronous modem contains the scrambler.
(d) Control section of a synchronous modem contains the scrambler

29. In a synchronous modem, the digital-to analogue converter transmits signal to the
(a) Equalizer
(b) Demodulator
(c) Modulator
(d) Terminal

30. Which of the following communications line is best suited to interactive processing applications ?
(a) Narrow band channels.
(b) Full-duplex lines
(c) Simplex lines
(d) Mixed band channels.

31. A remote batch-processing operation in which date is solely input to a central computer would require
(a) Telegraph line
(b) Mixed band channels
(c) Simplex lines
(d) All of the above

32. A band is always equivalent to
(a) A byte
(b) A bit
(c) Bits
(d) Bits
(e) None of the above

33. The loss in signal power as light travels down the fiber is called
(a) Attenuation
(b) Scattering
(c) Propagation
(d) Interruption

34. Avalance photo diode receivers can detect bits of transmitted date by receiving
(a) 100 photons
(b) 200 photons
(c) 200 photons
(d) 300 photons

35. Communications circuits that transmit date in both directions but not at the same time are operating in
(a) a simple mode
(b) a half-duplex mode
(c) a full-duplex mode
(d) an asynchronous mode

36. A medium-speed, switched communications services is
(a) Series 1000
(b) DDD
(c) Date phone 50
(d) All of the above

37. In communication satellite, multiple repeaters are known as
(a) Detector
(b) Stations
(c) Modulator
(d) Transponders

38. While transmitting odd-parity coded symbols, the number of zeros in each symbol is
(a) Odd
(b) Even
(c) Unknown
(d) Both (a) and (b) above

39. Date communications monitors available on the software marked include
(a) ENVIRONII
(b) BPL
(c) TOTAL
(d) TELENT

40. An example of an analog communication method is
(a) Laser beam
(b) Microwave
(c) Voice grade telephone line
(d) All of the above

41. Number of bits persymbol used in Baudot code is
(a) 7
(b) 8
(c) 5
(d) 9

42. What is the main difference between DDCMP and SDLC ?
(a) DDCMP does not need special hardware to final the beginning of a message
(b) DDCMP has a message header
(c) SDLC has an IP address
(d) SDLC does not use CRC

43. An example of digital, rather than analog, communications is
(a) DDD
(b) WATS
(c) DDS
(d) DDT

44. Terminals are required for
(a) Real-time, batch processing, and time-sharing.
(b) Real-time, time-sharing, and distributed processing
(c) Real-time distributed processing, and manger inquiry.
(d) Real-time, time-sharing and message switching

45. The receive equalizer reduces delay distortions using a
(a) Tapped delay lines
(b) Descrambler
(c) ) Gearshift
(d) Difference engine

46. In a synchronous modem, the receive equalizer is known as
(a) Adaptive equalizer
(b) Statistical equalizer
(c) Inpairment equalizer
(d) Compromise above

47. The channel in the date communication model can be
(a) Postal mail services
(b) Radio lines
(c) Telephone lines
(d) Any of the above

48. A date terminal serves as a (n)
(a) Effecter
(b) Sensor
(c) None of the above
(d) Both (a) and (b) above

49. Which of the following transmission systems provides the highest date to in individual device?
(a) Computer bus
(b) Voice and mode
(c) Telephone lines
(d) Leased lines

50. A protocol is a set of rules governing a time sequence of events that must take place.
(a) between peers
(b) between an interface
(c) between modems
(d) across an interface