Back to the full dot-point answer
SingaporeComputer ScienceQuick questions
Networks and the Internet
Quick questions on Network protection measures explained: O-Level Computing
7short 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 are firewalls?Show answer
A firewall monitors and controls the data passing between a network and the outside world. Using a set of rules, it blocks unwanted or suspicious traffic and allows trusted traffic. It acts as a barrier that helps prevent unauthorised access from the internet.
What is encryption?Show answer
Encryption scrambles data using a key so that it is unreadable to anyone without that key. It protects data both in transit (such as over HTTPS) and at rest (stored on a disk). If encrypted data is intercepted or stolen, the attacker sees only meaningless characters.
What is antivirus software?Show answer
Antivirus (anti-malware) software scans files and activity to detect, block and remove malware such as viruses and worms. Kept up to date, it recognises new threats and helps stop infections spreading across a network.
What are user access levels?Show answer
User access levels give different users different permissions. A student might only open their own work, a teacher edit class records, and an administrator manage accounts. This follows the principle of least privilege: each user can access only what they need, which limits misuse and contains the damage if one account is compromised.
What is q1?Show answer
State what a firewall does. [2 marks]
What is q2?Show answer
Explain why user access levels improve security. [2 marks]
What is q3?Show answer
Give one reason a password should not be reused across accounts. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.