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Data Transmission: Circuit Switching vs Packet Switching
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Data Transmission: Circuit Switching vs Packet Switching

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Questions and Answers

What is an advantage of serial transmission over parallel transmission?

  • Faster transmission
  • Requires less wires (correct)
  • Sends all bits simultaneously
  • Transmits longer distances
  • What is the main difference between simplex and half-duplex transmission?

  • Speed of data transmission
  • Type of data transmitted
  • Direction of data transmission (correct)
  • Number of data lines used
  • Which type of transmission sends all bits in a byte simultaneously?

  • Parallel transmission (correct)
  • Full-duplex transmission
  • Half-duplex transmission
  • Serial transmission
  • What is a benefit of using parallel transmission?

    <p>Faster transmission</p> Signup and view all the answers

    What is full-duplex transmission?

    <p>Two-way data transmission, simultaneously</p> Signup and view all the answers

    Why is it efficient to not send data where it is not required?

    <p>It saves bandwidth</p> Signup and view all the answers

    What is the main characteristic of circuit switching in a computer network?

    <p>A path is set up between the sender and receiver before transmission.</p> Signup and view all the answers

    What is an advantage of packet switching over circuit switching in terms of network failure?

    <p>It is less likely to be affected by network failure.</p> Signup and view all the answers

    What happens to packets in packet switching if they arrive out of order?

    <p>They are reassembled on arrival.</p> Signup and view all the answers

    Why is packet switching preferred in terms of security?

    <p>Because it is very difficult to intercept and reconstruct packets.</p> Signup and view all the answers

    What is the purpose of switching in a computer network?

    <p>To prevent all the data being sent to all parts of the network.</p> Signup and view all the answers

    What is a characteristic of packet switching in a computer network?

    <p>Each packet may be transmitted by different routes.</p> Signup and view all the answers

    What is an advantage of packet switching in terms of data line usage?

    <p>It makes more efficient use of data lines.</p> Signup and view all the answers

    What is the main difference between circuit switching and packet switching?

    <p>The path is set up before transmission in circuit switching.</p> Signup and view all the answers

    Study Notes

    Data Transmission Modes

    • Circuit switching: a path is set up between the sender and receiver before transmission, and all data follows the same path, in order.
    • Circuit switching: the path cannot be used by any other data during transmission.

    Packet Switching

    • Data is split into packets before transmission.
    • Each packet may be transmitted by different routes through the network.
    • Packets may arrive out of order and are reassembled on arrival.
    • Advantages of packet switching:
      • Better security as it is very difficult to intercept and reconstruct packets.
      • Makes more efficient use of data lines as there is no waiting during gaps.
      • Less likely to be affected by network failure because multiple paths are used.

    Switching in a Computer Network

    • Switching sends data along the appropriate path.
    • Switching prevents all the data being sent to all parts of the network.
    • It requires less bandwidth and is more efficient not to send data where it is not required.

    Serial and Parallel Transmission

    • Serial transmission:
      • Data is sent bit-by-bit along the same data line.
      • Advantages:
        • Requires only two wires compared to 8 or 16 in parallel.
        • Can travel longer distances than parallel.
        • Simpler interface/circuit board.
    • Parallel transmission:
      • All bits in a byte are sent simultaneously along separate data lines.
      • Advantage: transmission is faster than serial transmission.

    Data Transmission Directions

    • Simplex: data transmission is possible in one direction only along a computer network/pathway/cable.
    • Half-duplex: data can be sent in either direction, but only in one direction at a time.
    • Full-duplex: data can be sent in either direction, in both directions at the same time/simultaneously.

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    Description

    Compare and contrast circuit switching and packet switching in computer networks, highlighting the advantages of packet switching. Practice with past paper questions from Jan 2012.

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