MCQs of Computer Networking (5 set)

Paper – 1

Q. 1: The interactive transmission of data within a time sharing system may be best suited to 

• a. simplex lines
• b. half-duplex lines
• c. full duplex lines
• d. biflex-lines

Q. 2: 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. Teleprocessing combines telecommunications and DP techniques in online activities
• d. Batch processing is the preferred processing mode for telecommunication operation.

Q. 3: Which of hte following is considered a broad band communication channel?

• a. coaxial cable
• b. fiber optics cable
• c. microwave circuits
• d. all of above

 

Q. 4: Which of the following is not a transmission medium?

• a. telephone lines
• b. coaxial cables
• c. modem
• d. microwave systems

Q. 5: Which of the following does not allow multiple uses or devices to share one communication line?

• a. doubleplexer
• b. multiplexer
• c. concentrator
• d. controller

Q. 6: Which of the following signal is not standard RS-232-C signal?

• a. VDR
• b. RTS
• c. CTS
• d. DSR

Q. 7: Which of the following statement is incorrect?

• a. Multiplexers 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

Q. 8: Which of the following is an advantage to using fiber optics data transmission?

• a. resistance to data theft
• b. fast data transmission rate
• c. low noise level
• d. all of above

Q. 9: Which of the following is required to communicate between two computers?

• a. communications software
• b. protocol
• c. communication hardware
• d. all of above including access to transmission medium

Q. 10: The transmission signal coding method of TI carrier is called

• a. Bipolar
• b. NRZ
• c. Manchester
• d. Binary

Answers: 1. B, 2. D, 3. D, 4. C, 5. A, 6. A, 7. D, 8. D, 9. D, 10. A,

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Paper – 2

Q. 1 : Number of bits per symbol used in Baudot code is

• a. 7
• b. 5
• c. 8
• d. 9

Q. 2: 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 a IP address
• d. SDLC does not use CRC

Q. 3: An example of digital, rather than analog, communication is

• a. DDD
• b. DDS
• c. WATS
• d. DDT

Q. 4: Terminals are required for 

• a. real-time, batch processing & time-sharing
• b. real time, time-sharing & distributed message processing
• c. real time, distributed processing & manager inquiry
• d. real-time,  time sharing & message switching

Q. 5: The receive equalizer reduces delay distortions using a

• a. tapped delay lines
• b. gearshift
• c. descrambler
• d. difference engine

Q. 6: Ina synchronous modem, the receive equalizer is known as

• a. adaptive equalizer
• b. impairment equalizer
• c. statistical equalizer
• d. compromise equalizer 

Q. 7: The channel in the data communication model can be

• a. postal mail services
• b. telephone lines
• c. radio lines
• d. any of the above

Q. 8: A data terminal serves as an

• a. Effector
• b. sensor
• c. both a and b
• d. neither a nor b

Q. 9: Which of the following transmission systems provide the highest data rate to in individual device?

• a. computer bus
• b. telephone lines
• c. voice and mode
• d. lease lines

Q. 10: 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

Answers : 1. B, 2. A, 3. B, 4. D, 5. A, 6. A, 7. D, 8. C, 9. A, 10. A,

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Paper – 3

Q. 1: Which data communication method is used to transmit the data over a serial communication link?

• a. simplex
• b. half-duplex
• c. full-duplex
• d. b and c
• e. None of above

Q. 2: What is the minimum number of wires needed to send data over a serial communication link layer?

• a. 1
• b. 2
• c. 4
• d. 6
• e. none of above

Q. 3: Which of the following types of channels moves data relatively slowly?

• a. wide band channel
• b. voice band challen
• c. narrow band channel

Q. 4: Most data communications involving telegraph lines use:

• a. simplex lines
• b. wideband channel
• c. narrowband channel
• d. dialed service

Q. 5: A communications device that combines transmissions from several I/O devices into one line is a 

• a. concentrator
• b. modifier
• c. multiplexer
• d. full-duplex line

Q. 6: How much power (roughly) a light emitting diode can couple into an optical fiber?

• a. 100 microwatts
• b. 440 microwatts
• c. 100 Pico watts
• d. 10 mili watts

Q. 7: 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 bandwidth
• e. none of above

Q. 8: 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
• e. none of the above

Q. 9: In a synchronous modem, the digital-to-analog converter transmits signal to the 

• a. equalizer
• b. modulator
• c. demodulator
• d. terminal
• e. none of above

Q. 10: Which of the following communications lines is best suited to interactive processing applications?

• a. narrow band channel
• b. simplex lines
• c. full duplex lines
• d. mixed band channels

Answers : 1. C, 2. B, 3. C, 4. C, 5. C, 6. A, 7. B, 8. C, 9. A, 10. C,

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Paper -4

Q. 1: In OSI network architecture, the dialogue control and token management are responsibility of

• a. session layer
• b. network layer
• c. transport layer
• d. data link layer
• e. none of above
   

Q. 2: In OSI network architecture, the routing is performed by

• a. network layer
• b. data link layer
• c. transport layer
• d. session layer
• e. none of above

Q. 3: Which of the following performs modulation and demodulation?

• a. fiber optics
• b. satellite
• c. coaxial cable
• d. modem
• e. none of the above

Q. 4: The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:

• a. modulation
• b. demodulation
• c. synchronizing
• d. digitizing

Q. 5: How many OSI layers are covered in the X.25 standard?

• a. Two
• b. Three
• c. Seven
• d. Six
• e. None of above

Q. 6: Layer one of the OSI model is

• a. physical layer
• b. link layer
• c. transport layer
• d. network layer
• e. none of above

Q. 7: The x.25 standard specifies a 

• a. technique for start-stop data
• b. technique for dial access
• c. DTE/DCE interface
• d. data bit rate
• e. none of above

Q. 8: Which of the following communication modes support two-way traffic but in only one direction at a time?

• a. simplex
• b. half duplex
• c. three-quarters duplex
• d. all of the above
• e. none of the above

Q. 9: Which of the following might be used by a company to satisfy its growing communications needs?

• a. front end processor
• b. multiplexer
• c. controller
• d. concentrator
• e. all of the above

Q. 10: What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

• a. 4
• b. 2
• c. 6
• d. 3
• 3. None of the above

Correct Answers: 1. A, 2. A, 3. D, 4. D, 5. B, 6. A, 7. C, 8. B, 9. E, 10. D,

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Paper – 5

Q. :1 A remote batch-processing operation in which data is solely input to a central computer would require

• a. telegraph line
• b. simplex lines
• c. mixed bad channel
• d. all of above

Q. 2: A band is always equivalent to 

• a. a byte
• b. a bit
• c. 100 bits
• d. none of above

Q. 3: The loss in signal power as light travels down the fiber is called

• a. attenuation
• b. prorogation
• c. scattering
• d. interruption

Q. 4: Avalanche photodiode receivers can detect bits of transmitted data by receiving

• a. 100 photons
• b. 200 photons
• c. 2000 photons
• d. 300 photons

Q. 5: Communication circuits that transmit data in both directions but not at the same time are operating in

• a. a simplex mode
• b. a half duplex mode
• c. a full duplex mode
• d. an asynchronous mode

Q. 6: An example of a medium speed, switched communications service is

• a. series 1000
• b. data phone 50
• c. DDD
• d. All of the above

Q. 7: In communication satellite, multiple repeaters are known as

• a. detector
• b. modulator
• c. stations
• d. transponders

Q. 8: While transmitting odd-parity coded symbols, the number of zeros in each symbol is

• a. odd
• b. even
• c. a and b both
• d. unknown

Q. 9: Data communications monitors available on the software marked include

• a. ENVIRON/1
• b. TOTAL
• c. BPL
• d. Telnet

Q. 10: An example of an analog communication method is

• a. laser beam
• b. microwave
• c. voice grade telephone line
• d. all of the above

Answers : 1. B, 2. D, 3. A, 4. B, 5. B, 6. C, 7. D, 8. D, 9. A, 10. D.

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