OCR J277 1.3.2: Wired and wireless networks, protocols and layers
The free BugBot lessons that teach this point, a robot to try it on, and the past-paper questions that test it.
What it covers
When you send a photo across the internet, it does not travel as one piece. It is chopped into packets, each labelled with where it is going, and each may take a different route. At the other end, the packets are put back in order. This lesson covers the two kinds of address every device has, and how packet switching works.
- MAC addresses
- IP addresses
- Packet switching
Or do it in the simulator, with tasks that mark themselves
Lessons that teach it
- F10.5 Addresses and packets Networks
MAC and IP addresses, IPv4 and IPv6, and packet switching. - F10.7 Protocols Networks
Standards, and TCP, UDP, IP, HTTP, HTTPS, FTP, SMTP, POP and IMAP. - F10.8 Layers Networks
The four-layer TCP/IP model, encapsulation, and why layers are used. - F10.9 Project: reliable delivery Networks
Deliver a report over a lossy radio with packets, acknowledgements and resending.
Try it on a robot
The task from F10.5 Addresses and packets, running here. Change the program and press Run.
The specification is OCR's own document; this page says which of our lessons teach point 1.3.2 and is not endorsed by the board.