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SingaporeComputer Science

Networks and the Internet

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do IP addresses identify devices, and why do networks need agreed protocols?

Explain the purpose of IP addresses and protocols, describe how data is sent in packets, and give examples of common protocols
A focused answer to the O-Level Computing point on addressing and protocols. The purpose of an IP address, what a protocol is and why networks need agreed rules, how data travels in packets, and examples of common protocols.
6 min answer →

How do we protect a network and its data from threats?

Describe protection measures including strong passwords, firewalls, encryption, antivirus software and user access levels
A focused answer to the O-Level Computing point on protecting networks. Strong passwords and two-factor authentication, firewalls, encryption, antivirus software, user access levels, and how a layered defence works.
6 min answer →

What threats put a network and its data at risk?

Describe common network security threats including unauthorised access, interception, phishing and denial of service
A focused answer to the O-Level Computing point on network threats. Unauthorised access (hacking), data interception, phishing and social engineering, and denial of service attacks, and the harm each can cause.
6 min answer →

What is a computer network, and how do LANs and WANs differ?

Define a computer network, distinguish a LAN from a WAN, and state the benefits and drawbacks of networking computers
A focused answer to the O-Level Computing point on networks. What a computer network is, the difference between a LAN and a WAN, common networking hardware, and the benefits and drawbacks of connecting computers.
6 min answer →

What is the difference between the internet and the World Wide Web, and how does a web page reach your browser?

Distinguish the internet from the World Wide Web, and describe the roles of browsers, web servers, URLs and HTTP in loading a page
A focused answer to the O-Level Computing point on the internet and the Web. The difference between the internet (the network) and the Web (pages on it), and the roles of browsers, web servers, URLs, HTTP and HTTPS in loading a page.
6 min answer →