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  1. To avoid transmission errors, a check figure is calculated by the

  2. A.

     transmitting computer

    B.

     receiving computer

    C.

     both A and B

    D.

     Start and stop bit

    E.

     None of the above


  3. What is the first octet range for a class A IP address?

  4. A.

     1 - 126

    B.

     192 - 255

    C.

     192 - 223

    D.

     1 - 127

    E.

     128 - 191


  5. Which of the following is not a standard synchronous communication protocol?

  6. A.

     SDLC

    B.

     SMTP

    C.

     SLIP

    D.

     PAS

    E.

     None of the above


  7. The network layer, in reference to the OSI model, provide

  8. A.

     data link procedures that provide for the exchange of data via frames that can be sent and received

    B.

     the interface between the X.25 network and packet mode device

    C.

     the virtual circuit interface to packet-switched service

    D.

     All of the above

    E.

     None of the above


  9. In OSI network architecture, the routing is performed by

  10. A.

     network layer

    B.

     data link layer

    C.

     transport layer

    D.

     session layer

    E.

     None of the above


  11. Which of the following communications lines is best suited to interactive processing applications?

  12. A.

     narrowband channels

    B.

     simplex lines

    C.

     full-duplex lines

    D.

     mixed band channels

    E.

     None of the above


  13. What is the first octet range for a class B IP address?

  14. A.

     128 - 255

    B.

     1 - 127

    C.

     192 - 223

    D.

     128 - 191

    E.

     127 - 191


  15. The 32-bit internet address 10000000 00001010 00000010 00011110 will be written in dotted decimal notation as

  16. A.

     148.20.2.30

    B.

     164.100.9.61

    C.

     210.20.2.64

    D.

     128.10.2.30

    E.

     None of the above


  17. Which of the following items is not used in Local Area Networks (LANs)?

  18. A.

     Computer

    B.

     Modem

    C.

     Printer

    D.

     Cable

    E.

     None of the above


  19. Error detection at a data link level is achieved by

  20. A.

     bit stuffing

    B.

     cyclic redundancy codes

    C.

     Hamming codes

    D.

     equalization

    E.

     None of the above