Computer Networks Quiz

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Quiz Questions and Answers on Computer Networking

1. Which of the following is considered a broad band communication channel?
(a) coaxial code
(b) microwave circuits
(c) fibre optic cable
(d) satellite systems
(e) all of the above

2. Videotex is a combination of
(a) Television
(b) computer technology
(c) communication.
(d) all of the above

3. With telecommunications and a personal computer you can
(a) “download” free public domain programs
(b) send letters to be printed and delivered by the post office
(c) order goods at a substantial discount
(d) all of the above

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

5. 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

6. Name of the network topology in which there are bi-directional links between each possible node is
(a) Ring
(b) Tres
(c) Star
(d) Mesh

7. A T-switch is used to
(a) control how message are passed between computers
(b) echo every character that is received
(c) transmit characters one at a time
(d) rearrange the connections between computing equipment

8. Identify the odd terms amongst the following groups:
(a) Coaxial cable
(b) Optical fiber
(c) Twisted pair wire
(d) Microwaves

9. Which of the following statements is incorrect?
(a) Multiplexes 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 communication protocol.
(c) RTS/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.

10. Which of the following refers to the term “residual error rate”?
(a) the number of bit errors per twenty four hours of continuous operation on an asynchronous line
(b) the probability that one or more errors will be undetected when an error detection scheme is used
(c) the probability that one or more errors will be detected when an error detection mechanism is used
(d) signal to noise ratio divided by the ratio of energy per bit to noise per hertz.

11. Satellite transponders
(a) contain a receiver and transmitter designed to relay microwave transmission from one point on earth to another
(b) contain a device that echoes the radiation without changes from one point on earth to another
(c) contain devices that transform the message sent from one location on earth to a different code for transmission to another location.
(d) use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations

12. An advantage to using fiber optics data transmission is
(a) resistance to data theft
(b) low noise level
(c) fast data transmission rate
(d) few transmission errors
(e) all of the above

13. Modulation is the process of
(a) sending a file from one computer to another computer
(b) converting digital signals to analogue
(c) converting analogue signals to digital signals
(d) echoing every character that is received

14. Which of the following is true of parallel transmission?
(a) involves simultaneous transmission of eight bits
(b) the speed is quoted in bits per second
(c) slower than serial transmission
(d) most microcomputers communicate with other computers in this mode.

15. Sales persons and other employees of the company who spend much of their time away from their offices but keep in touch with their company’s microcomputers or mainframe computers over telephone lines are called
(a) field workers
(b) tele processors
(c) telecommuters
(d) company directors

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

17. The term ‘duplex’ refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver
(a) cannot talk at once
(b) can receive and send data simultaneously
(c) can send or receive data one at a time
(d) can do one data transmission only

18. Which company developed the TCP/IP protocol for networking
(a) IBM
(b) Novell
(c) DEC
(d) DARPA

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

20. Which of the following is required to communicate between two computers?
(a) communication software
(b) communication hardware
(c) protocol
(d) access to transmission medium
(e) all of the above

21. After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. It is called
(a) Telex
(b) Facsimile
(c) Word processor
(d) Electronic mail

22. Demodulation is the process of
(a) converting digital signals to analogue signals
(b) converting analogue signals to digital signals
(c) combining many low speed channels into one high speed channel
(d) dividing the high-speed signals into frequency bands

23. Main purpose of a data link content monitor is
(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 data

24. Data communication method which is used to transmit the data over a serial communication link is
(a) Simplex
(b) full duplex
(c) half-duplex
(d) both (b) and (c) above

25. A software that allows a personal computer to pretend it as a terminal is
(a) auto-dialling
(b) modem
(c) bulletin board.
(d) terminal emulation

26. Frequency ranges which is used for AM radio transmission is
(a) Very low frequency: 3 kHz to 30 kHz
(b) High frequency: 3 MHz to 30 MHz
(c) Medium frequency: 300 kHz to 3 MHz
(d) Very high frequency: 30 MHz to 300 MHz

27. An example of network layer is
(a) Source routing and domain naming UseNet
(b) X.25 Packet Level Protocol (PLP) ISO
(c) Internet Protocol (IP) ARPANET
(d) all of the above

28. Establishing a virtual connection is functionally equivalent to
(a) connecting as 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

29. Minimum number of wires needed to send data over a serial communication link layer is
(a) 1
(b) 2
(c) 4
(d) 6

30. In networking terminology UTP means
(a) unshelled Twisted-Pair
(b) Ubiquitous Teflon Port
(c) Uniformly Terminating Port
(d) Unshielded T-connector Port

31. Which of the following is not a device used in data communications?
(a) Modem
(b) Multiplexer
(c) statistical multiplexer
(d) front-end processor
(e) all of the above

32. For connecting mode, a computer must be equipped with a port 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) Recommended standard.
(c) Random sequence
(d) Registered source

33. Signals which is not standard RS-232-C signal is
(a) RTS
(b) DSR
(c) VLR
(d) CTS

34. The communication mode that supports data in both direction at the same time is
(a) Simplex
(b) full-duplex
(c) half-duplex
(d) multiplex

35. An encyclopaedic database
(a) is an information utility that specializes in storing and searching information
(b) be generally free
(c) is easy for beginners to use
(d) all of the above

36. A standard synchronous communication protocol is
(a) SDLC
(b) SMTP
(c) SLIP
(d) all of these

37. Types of channels which moves data relatively slowly is
(a) wide band channel
(b) narrow band channel.
(c) voice band channel
(d) broadband channel

38. The communication mode that supports two-way traffic but only one direction at a a time is
(a) Simplex
(b) half-duplex
(c) duplex
(d) multiplex

39. Data are followed to be transmitted in only one direction in a
(a) Simplex channel
(b) Dumb channel
(c) Half-duplex channel
(d) Full-duplex channel

40. 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 same as x400
(d) Teleprinters have a print for output and keyboard for input

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

42. The usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers is
(a) 6
(b) 8
(c) 9
(d) 7

43. Controls of data communication deal with
(a) the computer
(b) terminals
(c) the communication channel
(d) all of the above

44. 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) Communication software
(b) Error detecting protocols
(c) Telecommunications.
(d) Link access procedure (LAP)

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

46. Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmission. Which of the following events will always lead to an undeleted error?
(a) one bit or any odd number of bits inverted in a block of data during transmission
(b) two bits or any even number of bits inverted in a block during transmission
(c) one bit or any odd number of bits inverted in a byte during transmission
(d) two bits or any even number of bits inverted in a byte during transmission

47. The frequency range: 300 kHz to 3 MHz is used for
(a) AM radio transmission
(b) FM radio transmission
(c) TV transmission
(d) Microwave communications, satellite and radar

48. An example of bounded medium is
(a) Coaxial cable
(b) Fiber optic cabled
(c) Wave guide
(d) all the above

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

50. Which of the following is used for modulation and demodulation?
(a) Modem
(b) Protocols
(c) Gateway
(d) multiplexer