Network communications involves sending messages from one device to another. Networking software follows a strict set of rules, governerned by different protocols, when carrying out each task. Since there are many protocols and technologies that have been developed it is difficult to get compatability. To solve this problem a model has been developed called the Open System Interconnection (OSI) reference model.
Carol Lewis a senior IT teacher as made available this presentation to explain the OSI model (many thanks Carol). Click here to download the PowerPoint presentation with audio that you need to click through.
Delia Kench, Lee-Anne Coker and Richard Bradbury, authors of Exploring IT Grade 11 Theory has made available this chapter from the text book for online distribution during the lockdown period. Thank you Delia, Lee-Anne and Richard. Click here to view the pdf document. Once the grade 11 theory text book from Funworks has been delivered to your school in 2020, you will be able to get your copy from your IT teacher.
This section covers –
Static IP addresses, dynamic IP addresses, DHCP, ARP, Format of packets, Frames for Ethernet, IP addressing inclucing headers, payload, frame checks, VLAN tags with reference to switches, bridges and routers.
The OSI model – protocols and layers, top 3 versus the bottom 4, transport, network, data link and physical layers.