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Computer Science · Oct / Nov 2020 · Paper 12 · Question 1

0478

As printed in the paper

The question as text

Tina is creating a website for charity events. She uses HTML to create the website.

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

Show the answer and mark scheme

  • 1(a)[1]

    Any one from:

    Hypertext Mark-up Language
    Web authoring language // language used to write/create websites/web pages

  • 1(b)(i)[1]

    Presentation

  • 1(b)(ii)[6]

    One mark per each nibble:

    43

    0

    1

    0

    0

    0

    0

    1

    1

    B7

    1

    0

    1

    1

    0

    1

    1

    1

    F0

    1

    1

    1

    1

    0

    0

    0

    0

  • 1(c)(i)[1]

    Input

  • 1(c)(ii)[4]

    One from:

    Lossy (compression)

    Any three from:

    A (compression) algorithm is used
    Removes redundant/unnecessary data from the file
    Removes sounds that cannot be heard by the human ear/background noise
    Reduces sample rate
    Reduces sample resolution
    Data is permanently removed // original file cannot be re-instated
    Perceptual music shaping is used

    NOTE: If lossless given, marks can be awarded for a correct description of lossless as follow through.

    Any three from (lossless):

    A (compression) algorithm is used
    Repeating patterns are identified
    … are replaced with a value
    … and indexed
    No data is permanently removed // original file can be re-instated
    Suitable example of a lossless algorithm

  • 1(c)(iii)[2]

    Any two from:

    Quicker for her to upload
    Quicker for users to download
    Won’t slow website down as much when loading
    Takes up less storage space

  • 1(d)(i)[2]

    Handshake (layer)
    Record (layer)

  • 1(d)(ii)[6]

    Any six from:

    Client/browser requests secure connection to server
    Client/browser requests the server to identify itself
    Server provides a digital certificate
    Client/browser validates the certificate
    Client/browser send signal back to server (to begin transmission)
    Session caching can be used
    A session key is generated
    Encryption method is agreed // data is encrypted

  • 1(e)(i)[3]

    Any three from:

    Hacking
    Denial of service (DoS) attack
    Virus
    Malware

    NOTE: Three different type of malware can be awarded

  • 1(e)(ii)[4]

    Any four from:

    Acts as a firewall
    Monitor/filters/examines incoming and outgoing traffic
    Rules/criteria for traffic can be set // blacklist/whitelist set
    Blocks any traffic that does not meet criteria …
    … and can send a warning message to the user
    Stop the website failing in a DoS attack // DoS attack hits the proxy server and not the webserver
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