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  1. Which transmission mode is used for data communication along telephone lines?

  2. A.

     Parallel

    B.

     Serial

    C.

     Synchronous

    D.

     Asynchronous

    E.

     None of the above

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  3. Who invented the modem?

  4. A.

     Wang Laboratories Ltd.

    B.

     AT & T Information Systems, USA

    C.

     Apple Computers Inc.

    D.

     Digital Equipment Corpn.

    E.

     None of the above

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  5. With an IP address starting at 200, you currently have 10 subnets. What subnet mask should you use to maximize the number of available hosts?

  6. A.

     192

    B.

     224

    C.

     240

    D.

     248

    E.

     252

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  7. Which of the following communications modes support two-way traffic but in only one direction of a time?

  8. A.

     simplex

    B.

     half-duplex

    C.

     three-quarters duplex

    D.

     full-of the above

    E.

     None of the above

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  9. Which of the following TCP/IP internet protocol a diskless machine uses to obtain its IP address from a server?

  10. A.

     RDP

    B.

     RARP

    C.

     RIP

    D.

     X.25

    E.

     None of the above

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  11. In OSI network architecture, the dialogue control and token management are responsibilities of

  12. A.

     session layer

    B.

     network layer

    C.

     transport layer

    D.

     data link layer

    E.

     None of the above

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  13. Which of the following transmission systems provides the highest data rate to an individual device

  14. A.

     Computer bus

    B.

     Telephone lines

    C.

     Voice band modem

    D.

     leased lines

    E.

     None of the above

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  15. Which of the following connectivity devices is used to extend a network on a purely mechanical basis?

  16. A.

     Gateway

    B.

     Switch

    C.

     Router

    D.

     Active hub

    E.

     802.6

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  17. The IEEE 802 project of the 1980s involved further defining the lower two layers of the OSI model. A number of standards were agreed upon during that time. Which of the following is the standard for Ethernet?

  18. A.

     802.2

    B.

     802.3

    C.

     802.4

    D.

     802.5

    E.

     802.6

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  19. Which of the following digits are known as the terminal number of the Network User Address (NUA)?

  20. A.

     05-Jul

    B.

     01-Apr

    C.

     08-Dec

    D.

     13-14

    E.

     None of the above

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