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    Que.489699v5npCLASS TEST

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    shreekar.nyayapathi23

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    Que.489699v5npCLASS TEST

    Uploaded by

    shreekar.nyayapathi23
    4 views7 pages

    Original Title

    Que.489699v5npCLASS_TEST (Autosaved)

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    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    4 views7 pages

    Que.489699v5npCLASS TEST

    Uploaded by

    shreekar.nyayapathi23

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 7

    1. Explain OSI Model with neat diagram.

    State functionality, protocols and standard


    of each layer.
    2. Test if 011100101110 code word is correct, assuming they were created using
    an even parity Hamming Code .If one is incorrect; indicate what the correct code
    word should have been. Also, indicate what the original data was.

    3. Before data can be transmitted, they must be transformed to ________.


    a.

    periodic signals

    b.

    electromagnetic signals

    c.

    aperiodic signals

    d.

    low-frequency sine waves

    4. A periodic signal completes one cycle in 0.001 s. What is the frequency?


    a.

    1 Hz

    b.

    100 Hz

    c.

    1 KHz

    d.

    1 MHz

    5. The physical layer concerns with


    a.

    bit-by-bit delivery

    b.

    process to process delivery

    c.

    application to application delivery

    d.

    none of the above

    6. The physical layer translates logical communication requests from the ______
    into hardware specific operations.
    a.

    data link layer

    b.

    network layer

    c.

    trasnport layer

    d.

    application layer

    7. _______ is a type of transmission impairment in which the signal loses strength


    due to the resistance of the transmission medium.
    a.

    Attenuation

    b.

    Distortion

    c.
    Noise

    d.

    Decibel

    8. ________ is a type of transmission impairment in which the signal loses strength


    due to the different propagation speeds of each frequency that makes up the
    signal.
    a.

    Attenuation

    b.

    Distortion

    c.

    Noise

    d.

    Decibel

    9. ________ is a type of transmission impairment in which an outside source such


    as crosstalk corrupts a signal.
    a.

    Attenuation

    b.

    Distortion

    c.

    Noise

    d.

    Decibel

    10. _______ data are continuous and take continuous values.


    a.

    analog

    b.

    digital

    c.

    (a) or (b)

    d.

    none of the above

    11. The method of communication in which transmission takes place in both


    directions, but only one direction at a time is called

    A. Simplex

    B. Four wire circuit

    C. Full Duplex

    D. Half Duplex

    12. Error detection at the data link level is achieved by

    A. Bit Stuffing

    B. Cyclic Redundancy Code

    C. Hamming Code

    D. Equalization

    13. The OSI _______ layer is implemented mainly by hardware

    a. application
    b. session
    c. presentation
    d. physical
    14. As the data packet moves from the _______ layer down to the _______ layer,
    headers and a trailer are added
    A. application; physical
    B. physical; application
    C. network; application
    D. data link; application

    15. The _______ layer defines the characteristics of the interface between the
    devices and the transmission medium

    A. physical
    B. data link
    C. network
    D. transport

    16. The _______ is defined by the physical layer.

    A. logical address
    B. session dialog
    C. data rate
    D. encryption method
    E.
    17. Which of these is a standard interface for serial data transmission?

    A. ASCII
    B. RS232C
    C. 2
    D. Centronics

    18. Which type of topology is best suited for large businesses which must carefully
    control and coordinate the operation of distributed branch outlets?

    A. Ring
    B. Local area
    C. Hierarchical
    D. Star

    19. "Parity bits" are used for which of the following purposes?

    A. Encryption of data
    B. To transmit faster
    C. To detect errors
    D. To identify the user

    20. What kind of transmission medium is most appropriate to carry data in a computer
    network that is exposed to electrical interferences?

    A. Unshielded twisted pair


    B. Optical fiber
    C. Coaxial cable
    D. Microwave

    21. A collection of hyperlinked documents on the internet forms the ?.?

    A. World Wide Web (WWW)


    B. E-mail system
    C. Mailing list
    D. Hypertext markup language

    22. A proxy server is used as the computer?

    A. with external access


    B. acting as a backup
    C. performing file handling
    D. accessing user permissions

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