Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.
CommandPoint by Northrop Grumman offers a range of CAD systems for various ...
TriTech Software Systems is a company that specialises in Computer Aided Di...
London Ambulance CAD failure
The 1992 London Ambulance Service CAD failure is probably the most notoriou...
Washington State 911 Failure
A 911 emergency telephone system in Washington State and Oregon shut down f...
London ambulance failure (2017)
A 2017 failure of a London ambulance dispatch system is believed to have le...
Computer Aided Dispatch outage
A 911 system failure left emergency calls unanswered and is said to have co...
Load balancing videos
This short article and the associated video explain 5 load balancing algori...
Intergraph Computer-Aided Dispatch (I/CAD
Intergraph Computer-Aided Dispatch (I/CAD) is a system offering many of the...
Boolean logic worksheet pack
These three Boolean logic worksheets have exam style questions on logic sta...
1.2 Communication and Internet technologies
Click here for recommended Cambridge A-Level Computer Science textbooks.
Connecting to the Internet
The BBC's Connecting to the Internet does a good job of explaining the requirements for connecting to the Internet as well as the major media types (including, copper cable, fibre optic, ADSL, and 3/4G). The pages are very detailed and give advantages and disadvantages for each connection type.
Greg's Cable Map is an excellent site with an interactive map showing the location of major Internet backbones across the world. This is a great resource for helping students visualise just how Internet routing works.
BBC Bitesize has a good overview of the differences between LANs and WANs, including some very clear diagrams. It does not cover Personal Area Networks (PAN) though. The very similar GCSE Computer Science page includes both a video and an explanation of WPAN and PAN.
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.
How undersea cables are laid
This short video makes a good lesson starter or discussion prompt. It shows how fibre optic cables used for Internet backbones are laid beneath oceans. This is really useful for showing students that Internet routing is not a complicated or mythical process but, in fact, one which uses relatively basic technology.
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.
What Happens When You Click a Link?
This video explains step by step what happens when you enter a URL in your web browser. It covers looking up the IP address using the HOSTS file or DNS, connecting to the destination machine using TCP/IP, and using HTTP to fetch the page. It does a good job of breaking down the process into a series of simple steps that demystify this process for students (hopefully!).
IP addressing and routing
The final part of this BBC Computer Science page deals with issues of IP addressing and routing.
1.2.3 Client- and server-side scripting