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Computer Science · May / June 2023 · Paper 12 · Question 7

0478

As printed in the paper

The question as text

A distributed denial of service attack (DDoS) is a cyber security threat.

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

Show the answer and mark scheme

  • 7(a)[6]

    One mark for each part of the diagram (MAX six).

    The diagram demonstrates:

    Malware downloaded to several computers
    … turning it into a bot/zombie
    … creating a network of bots/zombies
    Third party/hacker initiating the attack
    Bots send requests to a web server at the same time
    The web server fails due to the requests
    Legitimate requests cannot reach the web server

    Initiates attack

    Third party

    BOT

    Botnet

    Requests

    Web

    server

    BOT

    BOT

    web server fails due

    to too many requests

    X

    Malware downloaded

    Cannot connect

    to computers turning

    to web server

    them into bots

    Computer

  • 7(b)[2]

    Any two from:

    e.g.

    Revenge
    To affect a company’s reputation
    Entertainment value
    To demand a ransom to stop it
    To test a system’s resilience

  • 7(c)[2]

    Any two from:

    Proxy server
    Firewall
    Users scanning their computers with anti-malware
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