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SingaporeComputer ScienceQuick questions
Networks and the Internet
Quick questions on Network security threats explained: O-Level Computing
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is unauthorised access (hacking)?Show answer
Unauthorised access is gaining entry to a network, system or account without permission. An attacker might guess or steal a password, or exploit a security weakness, then view, change or steal data they have no right to. This threatens the confidentiality and integrity of data.
What is data interception?Show answer
Data interception is capturing data as it travels across a network, such as reading messages sent over an unsecured public Wi-Fi network. The danger is that private information, passwords, messages or bank details, can be read and misused. Encryption (as in HTTPS) is the main defence, because it makes intercepted data unreadable.
What is denial of service (DoS)?Show answer
A denial of service attack floods a website or server with so many requests that it is overwhelmed and cannot respond to genuine users. The site slows down or goes offline, so legitimate visitors are denied the service. No data is necessarily stolen, but the service is disrupted.
What is q1?Show answer
State what phishing is. [2 marks]
What is q2?Show answer
Explain what a denial of service attack does. [2 marks]
What is q3?Show answer
State how encryption helps against data interception. [2 marks]
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