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Computer Science · Oct / Nov 2024 · Paper 11 · Question 4

0478

As printed in the paper

The question as text

A company decides to create a network for its devices. All the company devices are within a single room. The employees will need to use their devices to send data to each other and share files. The company decides to send data across the network using packet switching.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 4(a)[4]

    Any four from:

    The data packet has three sections
    It has a packet header …
    … that contains data such as the destination address
    It has a payload …
    … that contains the main data for the email
    It has a trailer …
    … that contains data such as the error detection system used

  • 4(b)(i)[4]

    Any four from:

    It sends the data multiple bits at the same time // It uses multiple wires
    … so the transmission speed of the data will be fast
    Data may not need to travel a long distance
    … as the devices are all within a single room
    It sends data in both directions at the same time
    … so users on the network can send data to each other with no delay

  • 4(b)(ii)[2]

    Any two from:

    More interference/crosstalk (due to multiple wires)
    Data may be skewed (due to multiple bits at a time) // bits may arrive out of order
    More chance of data collisions (as data sent in both directions at the same time)
    More chance of error in the data

  • 4(b)(iii)[1]

    Any one from:

    Serial simplex
    Serial half-duplex
    Serial full-duplex
    Parallel simplex
    Parallel half-duplex
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