Computing, Computer Science, and Information Technology resources for GCSE, IGCSE, IB, and GCE A-Level
Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.
Examples of Local Cryptocurrencies
Digital Money for Local Communities covers three examples of country-wide c...
A hash function takes arbitrary sized input data (e.g. a fil...
Cryptocurrencies vs regular currencies
What is Bitcoin and How Does it Work? is a high level overview of the Bitco...
Examples of Cryptocurrencies
Bitcoin is by far the most well known cryptocurrency. The Bitcoin website w...
Practice paper 3 exam questions
One of the drawbacks of the yearly case study is that there are no past p...
Emergency Management System Explainer Video
This short video gives an overview of some EMIS features. It includes many ...
Geographic Information Systems (GIS)
For some functionality, an EMIS may also be connected to a GIS (Geographic ...
Programming languages - from Scratch to machine code
The CS Field Guide has a very comprehensive guide to different types of pro...
Assembly language simulators
There are several assembly language simulators available for use online. Si...
3.5 Fundamentals of Computer Networks
A Guide to How the Internet Works
This smart-looking Prezi presentation by Phil Bagge is packed full of great graphics and makes a really use introduction to the Internet topic. It takes a clear and visual approach to the idea of a 'network of networks', and really helps students see the structure of the Internet.
Edexcel GCSE Computer Science: Networks
This video covers Topic 5.1 Networks from the Edexcel syllabus. This topic is very theory heavy, which makes this video a long but useful revision resource for GCSE students.
Computer Networks: Crash Course Computer Science
This 12 minute video gives a rapid overview of computer networks. Despite its short running time, a lot of topics are covered, including MAC addresses, ethernet cables, and networking hardware. Some of the concepts (e.g. collisions) may not be relevant to all Computer Science courses, but their explanations are often linked to other related concepts (for example, collisions is linked to bandwidth which in turn is linked to switches).
Video: There and Back Again: A Packet's Tale. How Does the Internet Work?
A really accessible overview of packet switching, using the example of accessing a web page. The steps are broken down and explained with real life examples, as a web page hosted in the US is fetched by a computer in the UK.
Video: How does the internet work? - James May's Q&A
This video with James May takes a while to get going, but about half way through it starts to put concepts together and make it clear how the Internet works. Everything is explained clearly and in easy to understand language.
Types of network: PAN, WAN, LAN, and WLAN
Very clear diagrams and explanations of PAN, LAN, WLAN, and WAN. The diagrams are clear and include the location of key hardware such as switches, clients, and servers.The following pages also have good coverage of the other Computer Science networking topics, including network topologies.
Computer network types
Computer Network Types is a short but clear explanation of the main types of networks in Computer Science. It covers PAN, LAN, MAN, and WAN with very clear diagrams and explanations.
Network cable types
About Tech has one of the better explanations of network cable types, covering the essentials including coaxial, twisted pair, and fibre optic. The hyperlink-studded text makes it easy to students to find out about any related terms or concepts which confuse them.
BBC Bitesize has clear revision materials for the three main network topologies: star network, bus network, and ring network. As always, their diagrams are very clear and easy to understand, and each topology has a clear table of its advantages and disadvantages.
Packet attack game
In this simple game students must attempt to corrupt, kill, or delay data packets as they are sent across the screen. This game might now seem very educational at first, but on later levels (5 onwards) the data transmitted has additional features to detect corruption. For example, packets are sent with a sequence number (just like an IP packet), so delaying a packet no longer causes problems. This game can lead to some good classroom discussions about how network protocols prevent the problems shown in the game.