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Class 12 · Computer Science worksheet

Computer Networks

CBSE Computer Science. Evolution of networking, PAN, LAN, MAN and WAN, network devices, bus, star, tree and mesh topologies, MAC and IP addresses, DNS, URLs and web services. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.

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Sample questions

Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.

Section A · multiple choice

  1. 1.

    The first network, which linked a few universities and research centres in 1969, was:

    1. the World Wide Web
    2. Ethernet
    3. NSFNET
    4. ARPANET
    Answer

    (d) ARPANET

  2. 2.

    What does a repeater do in a network?

    1. regenerates a weakened signal so it can travel further
    2. connects networks that use different protocols
    3. lets a computer join a wireless network
    4. sends the data only to the computer it is addressed to
    Answer

    (a) regenerates a weakened signal so it can travel further

  3. 3.

    Which type of network is this: the computers in one office floor sharing a printer?

    1. MAN
    2. PAN
    3. LAN
    4. WAN
    Answer

    (c) LAN

Section B · short answer

  1. 4.

    What is a computer network? Give two of its advantages.

    Answer

    Two or more computers linked to share data and resources; it lets users share files and printers and communicate quickly.

  2. 5.

    Name the network device that (a) converts digital data to analog signals for a telephone or cable line, and back (b) lets a computer join a wireless network.

    Answer

    (a) modem; (b) Wi-Fi card

    a modem; a Wi-Fi card

Section C · long answer

  1. 6.

    Describe the evolution of networking from ARPANET to the Internet.

    Answer

    ARPANET (1969) linked a few research and university computers. In the 1980s NSFNET connected universities with a faster backbone for academic use. Many networks joined them using the TCP/IP protocols, and they grew into the Internet, opened to the public and to business in the 1990s, with the World Wide Web on top.

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In the app, every Computer Networks sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.

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