Saturday, 28 November 2015

Computer Awareness Mock Test: Computer (Network) IT Quiz - 49

1. A distributed network configuration in which all data information pass through a central computer is
(a) bus network     
(b) star network     
(c) ring network     
(d) point-to-point network

 2. In a synchronous modem, the receive equalizer is known as
(a) adaptive equalizer     
(b) impairment equalizer     
(c) statistical equalizer     
(d) compromise equalizer
 
 3. 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
 
 4. 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 synchronous mode
 
 5. 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
 
 6. 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
 
 7. A communications device that combines transmission from several I/O devices into one line is a _______
(a) concentrator     
(b) modifier     
(c) multiplexer     
(d) full-duplex line
 
 8. How much power (roughly) a light emitting diode can couple into an optical fiber?
(a) 100 microwatts    
(b) 440 microwatts     
(c) 100 picowatts     
(d) 10 miliwatts
 
 9. 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
 
10. 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 these    
   
11. In a synchronous modem, the digital-to-analog converter transmit signal to the
(a) equalizer     
(b) modulator     
(c) demodulator     
(d) terminal
 
12. 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
 
13. 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
 
14. In OSI network architecture, the routing is performed by
(a) network layer     
(b) data link layer     
(c) transport layer     
(d) session layer
 
15. How many OSI layers are covered in the X.25 standard?
(a) Two     
(b) Three     
(c) Seven     
(d) Six
 
16. 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) None of these
 
17. 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
 
18. You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?
(a) 255.240.0.0     
(b) 255.248.0.0     
(c) 255.252.0.0     
(d) 255.254.0.0
 
19. What is the default subnet mask for a class C network?
(a) 127.0.0.1     
(b) 255.0.0.0     
(c) 255.255.0.0     
(d) 255.255.255.0
 
20. Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing plant in the suburbs. To enable everyone to share data and resources between the two LANs, what type of device(s) are needed to connect them? Choose the most correct answer.
(a) Modem     
(b) Cable     
(c) Hub     
(d) Router

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