Computer Networks Previous Year Questions and Answers

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Computer Networks Previous Year Questions and Answers

Previous Year Questions and Answers on Computer Networking

1. A group of packet from a source though an X.25 packet to sink arrive in the same order sent for
(a) VC, but not for PVC
(b) Both PVC and VC
(c) PVC, but not VC
(d) None of the above

2. “Store and forward” applies to
(a) distributed processing
(b) Time-sharing
(c) None of the above
(d) Both (a) and (b) above

3. Which class of the software packages allow people to send electronic mail along a network of computer and work stations?
(a) Memory resident package
(b) Project management package
(c) Date communication package
(d) Electronic mail package.

4. Transmission of computerised date from one location to another is called
(a) Date transfer
(b) Date communication
(c) Date flow
(d) Date management

5. The basic Ethernet design does not provide
(a) Access control
(b) Automatic retransmission of message
(c) Addressing
(d) Multiple virtual network

6. Which of the following is an important characteristic of LAN?
(a) Application independent interfaces
(b) Unlimited expansion
(c) Low cost access for band width channels
(d) Parallel transmission

7. The word telematics is a combination of
(a) Computer
(b) Informatics
(c) Telecommunication
(d) Both (b) and (c) above

8. One important characteristic of the hub architecture of ARC-net is
(a) Directionalized transmission
(b) Access control and addressing
(c) Multiple virtual networks
(d) Alternative routing

9. Which of the following statements is correct?
(a) Characteristic of the hub architecture of ARC- net is alternative routing
(b) Characteristic of LAN is unlimited expansion
(c) Characteristic of LAN is low cast access for low bandwidth channels
(d) Characteristic of the hub architecture of ARC-net is directionalized transmission.

10. What is the name of the device that connects two computers by means of a telephone line?
(a) Tape
(b) Bus
(c) Modem
(d) Cable

11. Which of the following date transmission media has the largest terrestrial range without the sue of repeaters of other devices?
(a) Hardwiring
(b) Microwave
(c) Satellite
(d) Laser

12. What function does a serial interface perform in date communication?
(a) Converts serial date into audio date signals.
(b) Converts analogue signals into digital signals.
(c) Converts parallel date into a stream of bits and vice-versa.
(d) Decodes incoming signals into computer date.

13. Which of the following is possible in a taken passing bus network
(a) In-service expansion
(b) Unlimited number of stations
(c) Both (a) and (b) above
(d) Unlimited distance

14. Which of the following statements is correct?
(a) Protocol converters are the same as multiplexers
(b) Protocol converters are the same as TOMS
(c) Protocol converters are usually not operated in pairs.
(d) Protocol converters are usually operated in pairs

15. What does the acronym (ISDN) stand for?
(a) Indian standard digital network
(b) Integrated services digital network
(c) Intelligent services digital network
(d) Integrated services data network

16. In a PC to telephone hookup for long distance communication, modem is connected between the telephone line and
(a) PC
(b) Crossover cable
(c) Synchronous part
(d) Asynchronous part

17. In geosynchronous orbit, satellite
(a) remains in a fixed position so that as earth rotates it can fully cover the earth
(b) remains in a fixed position related to paints or earth
(c) moves faster than the earth’s rotations so that it can cover larger portion of earth
(d) moves simultaneously

18. Which of the following statement is correct?
(a) Satellite transponders contain a receiver and transmitter designed to relay microwave transmission from one point one earth to another.
(b) Satellite transmission contain a device that transform the message sent from one location on earth to a different code for transmission to another location.
(c) Satellite transponders contain a device that echoes the radiation without change from one points on earth to another.
(d) Satellite transponders use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations.

19. Identify the odd term amongst the following group :
(a) Coaxial cable
(b) Twisted pair wire
(c) Optical fiber
(d) Microwaves

20. Many data communication networks have been established which provide a wealth of on demand information services to people at home. What is the name or the system which provides an interactive graphic-rich service that permits user to select what they want?
(a) Teletex system
(b) Videotext system
(c) Fax system
(d) Microwaves system

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21. Sales persons and other employees of the company who spend much of their time away from their offices but keen in touch with their company’s micro computers or main frame computers over telephone lines are called
(a) Field workers
(b) Tele processors
(c) Telecomputers
(d) Company directors

22. Business meetings and conferences can be held by linking distantly located people through a computer network. Not only the participants exchange information but are able to see each other. What it is called?
(a) Telemeeting
(b) Telemailing
(c) Teletalking
(d) Teleconferencing

23. Establishing a virtual connection is functionally equivalent to
(a) Connecting a virtual memory
(b) Physically connecting a DTE and DCE
(c) Placing a telephone call prior to a conversation
(d) Placing a modem prior to a conversation.

24. What is the main purpose of a data link content monitor?
(a) To detect problems in protocols
(b) To determine the type of transmission used in a data link.
(c) To determine the type of switching used in a data link.
(d) To determine the flow of date.

25. For connecting mode, a computer must be equipped with a part that conforms to the Rs-232 standard, of the Electronic Industries Association of America. What do the letters ‘RS’ stand for?
(a) Recognised standard.
(b) Random sequence
(c) Recommend standard.
(d) Registered source

26. Which of the following is not a standard synchronous communication protocol ?
(a) SDLC
(b) SLIP
(c) SMTP
(d) PAS

27. Which of the following statement is correct?
(a) Teleprinters are used for printing at remote locations, not for input
(b) Teleprinters are same as teletypes
(c) Teleprinters are some as X400
(d) Tele printers have a printer for output and keyboard for input

28. When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in meters permitted this null-modem connection ?
(a) 50
(b) 30
(c) 100
(d) 150

29. Which of the following is an example of bounded medium ?
(a) Coaxial cable
(b) Fiber optic cable
(c) Wave guide
(d) All of the above

30. The amount of uncertainty in a system of symbol is called ?
(a) Band width
(b) Entropy
(c) Loss
(d) Quantum

31. 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 ?
(a) Communications software
(b) Error detecting protocols
(c) Link access procedure (LAP)
(d) Telecommunications
32. Communication between computers is almost always.
(a) Serial
(b) Series paralleled
(c) Parallel
(d) Direct

33. Which of the following statement is correct?
(a) Buffering is the process of temporarily storing the data to allow for small variation in device speeds
(b) Buffering is a method to reduce cross talks
(c) Buffering is a method to reduce the routing overhead
(d) Buffering is storage of data within the transmitting medium until the receiver is ready to receive

34. What is the name given to the exchange of central signals which is necessary for establishing a connection between a modem and computer at one end of a line and another modem and computer at the other end?
(a) Handshaking
(b) Protocol
(c) Modem options
(d) Duplexing ad

35. Coaxial cable has conductors with
(a) equal resistance
(b) the same diameter
(c) a common axis
(d) both (a) and (b) above

36. The main difference between synchronous and asynchronous transmission is that
(a) the clocking is derived from the data in synchronous transmission
(b) the clocking is mixed with the data in asynchronous transmission
(c) the bandwidth required is different
(d) the pulse height is different

37. When you connect to an on-line information service, you are asked to provide some kind of identification such as you name an account number and a pass ward. What is the name given to this brief dialogue between you and the information system?
(a) Security procedure
(b) Safeguard procedure
(c) Identification procedure
(d) Log-on procedure

38. In communication software can e called the “traffic cap” of a micro-communication system, then what should the modem be called?
(a) Park
(b) Interface
(c) Bridge
(d) Link

39. Which of the following items is not used in local area network (LANS)?
(a) Computer
(b) Printers
(c) Modem
(d) Cable

40. The area of coverage of a satellite radio beam is known as
(a) Footprint
(b) Circular polarization
(c) Identity
(d) Beam width

41. The care diameter of a single-mode fibres is about
(a) 10 times the wavelength of the light carried in the fiber
(b) 10 times the fiber radius
(c) 7 times the light carried in the fiber
(d) 3 times the wavelength of the light carried in the fiber.

42. What is the name of the device that converts computers output into a form that can be transmitted over a telephone line?
(a) Teleport
(b) Multiplexer
(c) Modem
(d) Concentrator

43. The geostationary satellite used for communication systems
(a) rotates with the earth
(b) is positioned over equator
(c) remains stationary relative to the earth
(d) all the above

44. Which of the following statement is correct?
(a) A spin stabilized satellite used solar cells mounted on a cylinder body that continued rotates so that 40 a time and it also uses gyroscopic action of a spinning satellite to maintain its orientation towards the earth and the sun.
(b) A spin stabilized satellite uses solar panels whose cells are continually oriented towards the sun.
(c) Satellite transponders use lower frequency reception of radiation from earth stations and higher earth stations.
(d) Satellite transponders use a single frequency for reception and transmission from one paint on earth to another
(e) None of the above

45. Computers cannot communicate with each other directly over telephone lines because they use digital pules whereas telephone lines use analogue sound frequencies. What is the name of the device which permits digital to analogue conversion at the start of a long distance transmission ?
(a) Interface
(b) Attenuation
(c) Modem
(d) Teleprocessor

46. Modem is used in data transmission when was it invented and in which country?
(a) 1960, USA
(b) 1950, USA
(c) 1965, Germany
(d) 1962, Japan

47. Who invented the modem?
(a) Wang Laboratories Ltd.
(b) Apple Computers Inc.
(c) AT & T Inforatories System, USA
(d) Digital Equipment Corporation.

48. The cheapest modems can transmit
(a) 300 bits per second
(b) 2, 400 bits per second
(c) 1, 200 bits per second
(d) 4, 800 bits per second

49. A device that can convert digital signals to analogue signals is
(a) a packet
(b) a modem
(c) both a and b
(d) a block

50. All of the parts in a computer talk to each other by sending
(a) Digital signals
(b) Analog signals
(c) Smoothly varying signal waves
(d) Both (b) and (c) above