AQA 7517 4.9.4.9: Port forwarding
The free BugBot lesson that teach this point, a robot to try it on, and the past-paper questions that test it.
What it covers
The last lesson left two questions open. When a phone joins a network, how does it get an IP address, a subnet mask and a router to use, without anyone typing them in? And if every device at home has a private address that the Internet will not route, how does a web page ever reach it? The answers are three jobs your home router does all day: DHCP, NAT and port forwarding.
- DHCP
- NAT
- Port forwarding
Or do it in the simulator, with tasks that mark themselves
Lessons that teach it
- A12.6 DHCP, NAT and port forwarding Networks and the web
How a device gets its address, and how a router shares one public address with a whole network.
Try it on a robot
The task from A12.6 DHCP, NAT and port forwarding, running here. Change the program and press Run.
The specification is AQA's own document; this page says which of our lessons teach point 4.9.4.9 and is not endorsed by the board.