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  1. Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?

  2. A.

     1 slots

    B.

     5 slots

    C.

     10 slots

    D.

     14 slots

    E.

     None of the above

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  3. 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 metres permitted in this null-modem connection?

  4. A.

     80

    B.

     100

    C.

     30

    D.

     150

    E.

     None of the above

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  5. Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as

  6. A.

     Amplitude-shift keying

    B.

     Amplitude

    C.

     Amplitude modulation

    D.

     Aloha

    E.

     None of the above

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  7. You have been contracted to install a windows NT network in an office that is located in a strip mall. The office is located next to the power plant of the building, so a UPS (uninterruptible power supply) has already been installed. What type of cable should you use for the network cabling? Choose the best answer.

  8. A.

     TI

    B.

     UTP

    C.

     Fiber-optic

    D.

     PSTN

    E.

     STP

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

  10. A.

     a simplex mode

    B.

     a half-duplex mode

    C.

     a full-duplex mode

    D.

     an asynchronous mode

    E.

     None of the above

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  11. In a synchronous modem, the digital-to-analog converter transmits signal to the

  12. A.

     equalizer

    B.

     modulator

    C.

     demodulator

    D.

     terminal

    E.

     None of the above

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  13. If the client receives an address from a DHCP server, what is the only information available in the Network Properties dialog box?

  14. A.

     The IP address

    B.

     The subnet address

    C.

     That the client is receiving its address from DHCP

    D.

     The default gateway

    E.

     None of the above

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  15. An internetworking protocol that provides virtual circuit service across multiple X.25 protocol, is

  16. A.

     X.75

    B.

     X.25

    C.

     X.400

    D.

     X.21

    E.

     None of the above

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  17. Which of the following TCP/IP protocol is used for transferring files from one machine to another?

  18. A.

     RARP

    B.

     ARP

    C.

     TCP

    D.

     FTP

    E.

     None of the above

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  19. Which of the following is an example of bounded medium?

  20. A.

     Coaxial cable

    B.

     Wave guide

    C.

     Fiber optic cable (d) All of the above

    D.

     None of the above

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